---
type: "firecrawl-provider"
description: "Sound recordings from the Library of Congress (loc.gov): field recordings, folk music, oral histories, speeches and early commercial records from the American Folklife Center, the National Jukebox and other collections. Search audio with date, location, subject, contributor and collection filters, read one recording with its rights statement, licence flags, attribution, citation and file URLs, and list the audio collections. Keyless JSON API; returns URLs only, never audio bytes."
use_when: "Sound recordings from the Library of Congress (loc.gov): field recordings, folk music, oral histories, speeches and early commercial records from the American Folklife Center, the National Jukebox and other collections. Search audio with date, location, subject, contributor and collection filters, read one recording with its rights statement, licence flags, attribution, citation and file URLs, and list the audio collections. Keyless JSON API; returns URLs only, never audio bytes."
categories: "Entertainment"
capabilities: 3
credits_per_call: 5
---
# Library of Congress Audio on Firecrawl Alexandria

Sound recordings from the Library of Congress (loc.gov): field recordings, folk music, oral histories, speeches and early commercial records from the American Folklife Center, the National Jukebox and other collections. Search audio with date, location, subject, contributor and collection filters, read one recording with its rights statement, licence flags, attribution, citation and file URLs, and list the audio collections. Keyless JSON API; returns URLs only, never audio bytes.

- Categories: Entertainment
- Category index: [Entertainment category](https://firecrawl.dev/alexandria/agents/categories/entertainment)
- Provider key: `loc-gov`
- Access: Firecrawl credits
- Cost: 5 credits per call

## More

- [Human guide](https://firecrawl.dev/app/alexandria/loc-gov)
- [OpenAPI spec](https://firecrawl.dev/alexandria/agents/providers/loc-gov/openapi.json)

## Capabilities

- [Get audio](https://firecrawl.dev/alexandria/agents/providers/loc-gov/audio-assets/get_audio): One Library of Congress sound recording by item id or loc.gov/item/<id>/ URL: title, date, contributors, locations, subjects, genres, notes, collections, holding division, medium, call number, a licence object from the item's rights statement, the collection's full rights statement and credit line, attribution and Chicago citation, duration when published, and every audio file with its downloadable flag. Never downloads the audio.
- [List audio collections](https://firecrawl.dev/alexandria/agents/providers/loc-gov/audio-assets/list_audio_collections): List Library of Congress collections that contain sound recordings, with slug, title, description, item count, date span, subjects and rights page; optional keyword filter; pages with continuation.
- [Search audio](https://firecrawl.dev/alexandria/agents/providers/loc-gov/audio-assets/search_audio): Search Library of Congress sound recordings by keyword, optionally inside one collection (e.g. national-jukebox), with a year range and location, subject, contributor and part-of filters; online-playable audio only by default. Pages with continuation. Every result carries title, date, contributors, locations, subjects, collections, a licence object built from the item's own rights statement (code, statement, rights URL, commercial_use, restricted), a ready-to-paste attribution, the page URL and the preview and download URLs loc.gov allows. Accepts loc.gov/audio/?q=... and loc.gov/collections/<slug>/ URLs.

## 1. Choose this provider when

Sound recordings from the Library of Congress (loc.gov): field recordings, folk music, oral histories, speeches and early commercial records from the American Folklife Center, the National Jukebox and other collections. Search audio with date, location, subject, contributor and collection filters, read one recording with its rights statement, licence flags, attribution, citation and file URLs, and list the audio collections. Keyless JSON API; returns URLs only, never audio bytes.

## 2. Minimal request

Call `POST https://api.firecrawl.dev/v2/scrape` with `{ alexandria: { provider, capability, options } }`. For a batch, send `{ alexandria: [...] }` with up to 10 calls.

```json
{
  "provider": "loc-gov",
  "capability": "audio-assets/get_audio",
  "options": {
    "id": "lomaxbib000313"
  }
}
```

## 3. Add provider options

Use only the options needed for the task:

- `id` (string): loc.gov item id, e.g. lomaxbib000313 or jukebox-61427. Example: `<id>`
- `url` (string): A loc.gov/item/<id>/ page URL. Example: `<url>`

## 4. Request through your preferred interface

### JavaScript

```javascript
const result = await firecrawl.scrape({
  alexandria: {
    provider: "loc-gov",
    capability: "audio-assets/get_audio",
    options: {
      id: "lomaxbib000313",
    },
  },
});
```

### Python

```python
result = firecrawl.scrape_alexandria({
  "provider": "loc-gov",
  "capability": "audio-assets/get_audio",
  "options": {
    "id": "lomaxbib000313"
  }
})
```

### cURL

```sh
curl https://api.firecrawl.dev/v2/scrape \
  -H "Authorization: Bearer $FIRECRAWL_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "alexandria": {
    "provider": "loc-gov",
    "capability": "audio-assets/get_audio",
    "options": {
      "id": "lomaxbib000313"
    }
  }
}'
```

### CLI

```sh
firecrawl scrape 'loc-gov/audio-assets/get_audio' \
  --options '{"id":"lomaxbib000313"}'
```


### MCP

Call the FCX MCP retrieve tool with this object:

```json
{
  "provider": "loc-gov",
  "capability": "audio-assets/get_audio",
  "options": {
    "id": "lomaxbib000313"
  }
}
```

Ask for only the returned fields needed by the task.

## 5. Full request shape

```json
{
  "provider": "loc-gov",
  "capability": "audio-assets/get_audio",
  "options": {
    "id": "lomaxbib000313"
  }
}
```

## 6. Response data

The response includes `success`, `provider`, `capability`, `creditsCost` and `data`. This example shows the provider payload in `data`:

```json
{
  "access_restricted": false,
  "attribution": "\"Cotton Picking Song\", John and Ruby Lomax 1939 southern states recording trip (AFC 1939/001), American Folklife Center, Library of Congress, https://www.loc.gov/item/lomaxbib000313/",
  "call_number": "AFC 1939/001: AFS 02666a01",
  "citation": "Lomax, John A, Ruby T Lomax, and Henry Truvillion. Cotton Picking Song. between Newton and Burkeville, Texas, May 18, 1939. Audio. https://www.loc.gov/item/lomaxbib000313/.",
  "collections": [
    "southern mosaic: the john and ruby lomax 1939 southern states recording trip",
    "performing arts encyclopedia",
    "the library of congress celebrates the songs of america",
    "american folklife center",
    "american memory"
  ],
  "contributors": [
    "Lomax, John A. (John Avery), 1867-1948 (Collector)",
    "Lomax, Ruby T. (Ruby Terrill) (Collector)",
    "Truvillion, Henry (Performer)"
  ],
  "credit_line": "John and Ruby Lomax 1939 southern states recording trip (AFC 1939/001), American Folklife Center, Library of Congress",
  "date": "1939-05-18",
  "description": null,
  "download_url": "https://tile.loc.gov/storage-services/media/afc/lomax/afc1939001_02666a1.mp3",
  "duration_seconds": null,
  "files": [
    {
      "download_allowed": false,
      "format": "mp3",
      "mime_type": "audio/mp3",
      "resource_url": null,
      "size_bytes": null,
      "url": "https://tile.loc.gov/storage-services/media/ingested/api/loc.afc.afcss39.2666a1.mp3"
    },
    {
      "download_allowed": true,
      "format": "mp3",
      "mime_type": "audio/mp3",
      "resource_url": null,
      "size_bytes": null,
      "url": "https://tile.loc.gov/storage-services/media/afc/lomax/afc1939001_02666a1.mp3"
    }
  ],
  "format": "mp3",
  "genres": [
    "Music",
    "Songs",
    "Work songs"
  ],
  "id": "lomaxbib000313",
  "languages": [
    "eng"
  ],
  "license": {
    "attribution_required": false,
    "code": "no_known_restrictions",
    "commercial_use": true,
    "name": "No known restrictions on use or reproduction.",
    "note": null,
    "restricted": false,
    "url": "https://www.loc.gov/collections/john-and-ruby-lomax/about-this-collection/rights-and-access/"
  },
  "locations": [
    "United States -- Texas -- Newton County -- between Newton and Burkeville"
  ],
  "medium": "sound disc : analog, 78 rpm ; 12 in.",
  "mime_types": [
    "application/x-audio"
  ],
  "notes": [
    "Venue: Farmhouse of Henry Truvillion",
    "Collector's genre note: \"Cotton Picking and Hauling Song\"",
    "Performance Note: \"Cotton Picking Song\" performed by Henry Truvillion (vocals) at his farmhouse, between Newton and Burkeville, Texas, on May 18, 1939."
  ],
  "observed_at_ms": 1793750400000,
  "page_url": "https://www.loc.gov/item/lomaxbib000313/",
  "preview_url": "https://tile.loc.gov/storage-services/media/ingested/api/loc.afc.afcss39.2666a1.mp3",
  "repository": "American Folklife Center",
  "rights_statement": "The Library of Congress is not aware of any U.S. copyright protection (see Title 17, U.S.C.) or any other restrictions in the material in this collection, except as noted below. Users should keep in mind that the Library of Congress is providing access to these materials strictly for educational and research purposes. The written permission of the copyright owners and/or other holders of rights (such as publicity and/or privacy rights) is required for distribution, reproduction, or other use of protected items beyond that allowed by fair use or other statutory exemptions. Responsibility for making an independent legal assessment of an item and securing any necessary permissions ultimately rests with persons desiring to use the item. See our Legal Notices and Privacy and Publicity Rights for additional information and restrictions. The Center asks that researchers approach the materials in this collection with respect for the culture and sensibilities of the people whose lives, ideas, and creativity are documented here. Researchers are also reminded that privacy and publicity rights may pertain to certain uses of this material. A small subset the sound recordings in this collection are not included in this online presentation because there is a strong possibility that there may be underlying rights in musical lyrics or compositions. Researchers with an interest or need to review the entire body of material are encouraged to contact the American Folklife Center: Those song titles not included are: Bull-Cow Blues Don't You Leave Me Here Everybody's Down on Me Little Log Cabin Louise Maria Springtime in the Rockies Credit line John and Ruby Lomax 1939 southern states recording trip (AFC 1939/001), American Folklife Center, Library of Congress",
  "source_collection": "John and Ruby Lomax 1939 Southern States Recording Trip (AFC 1939/001)",
  "source_url": "https://www.loc.gov/item/lomaxbib000313/?fo=json&at=item,resources,cite_this",
  "subjects": [
    "United States -- Texas -- Newton County -- between Newton and Burkeville",
    "Music",
    "Songs",
    "Work songs"
  ],
  "title": "Cotton Picking Song"
}
```

## API reference-derived contract

The following capability contract is generated from the same normalized Alexandria API reference exposed in the API spec.

### Get audio

- Capability: `audio-assets/get_audio`
- Description: One Library of Congress sound recording by item id or loc.gov/item/<id>/ URL: title, date, contributors, locations, subjects, genres, notes, collections, holding division, medium, call number, a licence object from the item's rights statement, the collection's full rights statement and credit line, attribution and Chicago citation, duration when published, and every audio file with its downloadable flag. Never downloads the audio.
- Instructions: Check the rights statement and credit line of a chosen recording before reuse, or get its playable and downloadable file URLs.
- Cost: 5 credits per call
- Capability file: [Get audio](https://firecrawl.dev/alexandria/agents/providers/loc-gov/audio-assets/get_audio)

Accepted options:
- `id` (string): loc.gov item id, e.g. lomaxbib000313 or jukebox-61427. Example: `<id>`
- `url` (string): A loc.gov/item/<id>/ page URL. Example: `<url>`

Response schema example:
```json
{
  "access_restricted": false,
  "attribution": "\"Cotton Picking Song\", John and Ruby Lomax 1939 southern states recording trip (AFC 1939/001), American Folklife Center, Library of Congress, https://www.loc.gov/item/lomaxbib000313/",
  "call_number": "AFC 1939/001: AFS 02666a01",
  "citation": "Lomax, John A, Ruby T Lomax, and Henry Truvillion. Cotton Picking Song. between Newton and Burkeville, Texas, May 18, 1939. Audio. https://www.loc.gov/item/lomaxbib000313/.",
  "collections": [
    "southern mosaic: the john and ruby lomax 1939 southern states recording trip",
    "performing arts encyclopedia",
    "the library of congress celebrates the songs of america",
    "american folklife center",
    "american memory"
  ],
  "contributors": [
    "Lomax, John A. (John Avery), 1867-1948 (Collector)",
    "Lomax, Ruby T. (Ruby Terrill) (Collector)",
    "Truvillion, Henry (Performer)"
  ],
  "credit_line": "John and Ruby Lomax 1939 southern states recording trip (AFC 1939/001), American Folklife Center, Library of Congress",
  "date": "1939-05-18",
  "description": null,
  "download_url": "https://tile.loc.gov/storage-services/media/afc/lomax/afc1939001_02666a1.mp3",
  "duration_seconds": null,
  "files": [
    {
      "download_allowed": false,
      "format": "mp3",
      "mime_type": "audio/mp3",
      "resource_url": null,
      "size_bytes": null,
      "url": "https://tile.loc.gov/storage-services/media/ingested/api/loc.afc.afcss39.2666a1.mp3"
    },
    {
      "download_allowed": true,
      "format": "mp3",
      "mime_type": "audio/mp3",
      "resource_url": null,
      "size_bytes": null,
      "url": "https://tile.loc.gov/storage-services/media/afc/lomax/afc1939001_02666a1.mp3"
    }
  ],
  "format": "mp3",
  "genres": [
    "Music",
    "Songs",
    "Work songs"
  ],
  "id": "lomaxbib000313",
  "languages": [
    "eng"
  ],
  "license": {
    "attribution_required": false,
    "code": "no_known_restrictions",
    "commercial_use": true,
    "name": "No known restrictions on use or reproduction.",
    "note": null,
    "restricted": false,
    "url": "https://www.loc.gov/collections/john-and-ruby-lomax/about-this-collection/rights-and-access/"
  },
  "locations": [
    "United States -- Texas -- Newton County -- between Newton and Burkeville"
  ],
  "medium": "sound disc : analog, 78 rpm ; 12 in.",
  "mime_types": [
    "application/x-audio"
  ],
  "notes": [
    "Venue: Farmhouse of Henry Truvillion",
    "Collector's genre note: \"Cotton Picking and Hauling Song\"",
    "Performance Note: \"Cotton Picking Song\" performed by Henry Truvillion (vocals) at his farmhouse, between Newton and Burkeville, Texas, on May 18, 1939."
  ],
  "observed_at_ms": 1793750400000,
  "page_url": "https://www.loc.gov/item/lomaxbib000313/",
  "preview_url": "https://tile.loc.gov/storage-services/media/ingested/api/loc.afc.afcss39.2666a1.mp3",
  "repository": "American Folklife Center",
  "rights_statement": "The Library of Congress is not aware of any U.S. copyright protection (see Title 17, U.S.C.) or any other restrictions in the material in this collection, except as noted below. Users should keep in mind that the Library of Congress is providing access to these materials strictly for educational and research purposes. The written permission of the copyright owners and/or other holders of rights (such as publicity and/or privacy rights) is required for distribution, reproduction, or other use of protected items beyond that allowed by fair use or other statutory exemptions. Responsibility for making an independent legal assessment of an item and securing any necessary permissions ultimately rests with persons desiring to use the item. See our Legal Notices and Privacy and Publicity Rights for additional information and restrictions. The Center asks that researchers approach the materials in this collection with respect for the culture and sensibilities of the people whose lives, ideas, and creativity are documented here. Researchers are also reminded that privacy and publicity rights may pertain to certain uses of this material. A small subset the sound recordings in this collection are not included in this online presentation because there is a strong possibility that there may be underlying rights in musical lyrics or compositions. Researchers with an interest or need to review the entire body of material are encouraged to contact the American Folklife Center: Those song titles not included are: Bull-Cow Blues Don't You Leave Me Here Everybody's Down on Me Little Log Cabin Louise Maria Springtime in the Rockies Credit line John and Ruby Lomax 1939 southern states recording trip (AFC 1939/001), American Folklife Center, Library of Congress",
  "source_collection": "John and Ruby Lomax 1939 Southern States Recording Trip (AFC 1939/001)",
  "source_url": "https://www.loc.gov/item/lomaxbib000313/?fo=json&at=item,resources,cite_this",
  "subjects": [
    "United States -- Texas -- Newton County -- between Newton and Burkeville",
    "Music",
    "Songs",
    "Work songs"
  ],
  "title": "Cotton Picking Song"
}
```

### List audio collections

- Capability: `audio-assets/list_audio_collections`
- Description: List Library of Congress collections that contain sound recordings, with slug, title, description, item count, date span, subjects and rights page; optional keyword filter; pages with continuation.
- Instructions: Pick a collection to browse with search_audio's collection input, e.g. folk music, oral histories or historic commercial records.
- Cost: 5 credits per call
- Capability file: [List audio collections](https://firecrawl.dev/alexandria/agents/providers/loc-gov/audio-assets/list_audio_collections)

Accepted options:
- `continuation` (string): Cursor from a previous call. Example: `<continuation>`
- `limit` (number): Collections per page; default 20. Example: `10`
- `query` (string): Words to match collection titles and descriptions, e.g. folk. Example: `<query>`

Response schema example:
```json
{
  "collections": [
    {
      "dates": "2024",
      "description": "This collection is based on the project, Evolution of Blacks in Ballet in Washington D.C., which was supported by a 2024 American Folklife Center Community Collections Grant (CCG) and led by Emmy-nominated producer, filmmaker, and storyteller Kamilah Thurmon. The collection features oral interviews with African American, Washington, D.C.-based ballet legends Sandra Fortune-Green, Virginia Johnson, Beatrice Davis-Williams, Lynn Welters, and Kahina Haynes. In addition, video footage of ballet classes and recitals are also documented to illuminate the ways their knowledge and skills are passed on…",
      "formats": [
        "sound recording",
        "film, video",
        "photo, print, drawing",
        "manuscript/mixed material"
      ],
      "item_count": 15,
      "rights_url": "https://www.loc.gov/collections/african-american-ballet-in-washington-dc/about-this-collection/rights-and-access/",
      "slug": "african-american-ballet-in-washington-dc",
      "subjects": [
        "dance",
        "performing arts",
        "sound recordings",
        "interviews",
        "american history",
        "ballet",
        "local history & folklife",
        "african american history",
        "digital photographs",
        "oral histories",
        "color",
        "arts and culture",
        "video recordings"
      ],
      "title": "African American Ballet in Washington, D.C.: A Legacy in Motion",
      "url": "https://www.loc.gov/collections/african-american-ballet-in-washington-dc/about-this-collection/"
    },
    {
      "dates": "1883-1923",
      "description": "The core of this presentation consists of \"stock\" arrangements for bands or small orchestras of popular songs written by African Americans. In addition, we offer a smaller selection of historic sound recordings illustrating these songs and many others by the same composers (the arrangements might not necessarily be the same as those on the stocks). Educational materials include short biographies of composers and performers of the time and historical essays.",
      "formats": [
        "notated music",
        "sound recording"
      ],
      "item_count": 308,
      "rights_url": "https://www.loc.gov/collections/african-american-band-music/about-this-collection/rights-and-access/",
      "slug": "african-american-band-music",
      "subjects": [
        "performing arts",
        "american history",
        "african-americans",
        "african american history",
        "band music",
        "music",
        "arts and culture",
        "recordings"
      ],
      "title": "African-American Band Music & Recordings, 1883-1923",
      "url": "https://www.loc.gov/collections/african-american-band-music/about-this-collection/"
    },
    {
      "dates": "1941-1942",
      "description": "After the Day of Infamy: \"Man-on-the-Street\" Interviews Following the Attack on Pearl Harbor presents approximately twelve hours of opinions recorded in the days and months following the bombing of Pearl Harbor, Hawaii, from more than two hundred individuals in cities and towns across the United States. On December 8, 1941 (the day after the Japanese attack on Pearl Harbor), Alan Lomax, then \"assistant in charge\" of the Archive of American Folk Song (now the American Folklife Center archive), sent a telegram to fieldworkers in ten different localities across the United States, asking them to c…",
      "formats": [
        "sound recording"
      ],
      "item_count": 139,
      "rights_url": "https://www.loc.gov/collections/interviews-following-the-attack-on-pearl-harbor/about-this-collection/rights-and-access/",
      "slug": "interviews-following-the-attack-on-pearl-harbor",
      "subjects": [
        "racial prejudice",
        "war & military",
        "interviews",
        "american history",
        "lomax, alan",
        "world war ii",
        "great depression & world war ii",
        "labor disputes",
        "pearl harbor"
      ],
      "title": "After the Day of Infamy: \"Man-on-the-Street\" Interviews Following the Attack on Pearl Harbor",
      "url": "https://www.loc.gov/collections/interviews-following-the-attack-on-pearl-harbor/about-this-collection/"
    },
    {
      "dates": "1938",
      "description": "In 1938 the Library of Congress dispatched the pioneering folklorist and song collector Alan Lomax—already a seasoned field worker at age 23—to conduct a folk song survey of the Great Lakes region. He traveled in a 1935 Plymouth sedan, toting a Presto disc recorder and a movie camera. When he returned nearly three months later, having driven thousands of miles on barely paved roads, it was with a cache of 250 instantaneous discs and eight reels of film documenting the incredible range of ethnic diversity and expressive traditions primarily in Michigan.",
      "formats": [
        "sound recording"
      ],
      "item_count": 1270,
      "rights_url": "https://www.loc.gov/collections/alan-lomax-in-michigan/about-this-collection/rights-and-access/",
      "slug": "alan-lomax-in-michigan",
      "subjects": [
        "songs",
        "performing arts",
        "field recordings",
        "finnish americans",
        "irish americans",
        "local history & folklife",
        "world cultures & history",
        "folk music",
        "music",
        "arts and culture",
        "franco americans"
      ],
      "title": "Alan Lomax Collection of Michigan and Wisconsin Recordings",
      "url": "https://www.loc.gov/collections/alan-lomax-in-michigan/about-this-collection/"
    },
    {
      "dates": "1930-2000",
      "description": "This collection highlights the history of the hymn &ldquo;Amazing Grace&rdquo; from the earliest printing of the song to selected performances of it on published and field recordings. These items have been collected from several divisions in the Library of Congress, including the Music Division, the American Folklife Center, the Motion Picture, Broadcasting and Recorded Sound Division, and the Rare Books Division. Also available here is the Chasanoff/Elozua Amazing Grace Collection of data on published recorded performances of the hymn \"Amazing Grace\" by more than 3000 different musicians or e…",
      "formats": [
        "sound recording",
        "book",
        "notated music"
      ],
      "item_count": 51,
      "rights_url": "https://www.loc.gov/collections/amazing-grace/about-this-collection/rights-and-access/",
      "slug": "amazing-grace",
      "subjects": [
        "songs",
        "performing arts",
        "revolution",
        "amazing grace",
        "religion & philosophy",
        "chasanoff/elozua",
        "music",
        "articles",
        "arts and culture",
        "recordings",
        "hymns"
      ],
      "title": "Amazing Grace",
      "url": "https://www.loc.gov/collections/amazing-grace/about-this-collection/"
    }
  ],
  "count": 5,
  "observed_at_ms": 1793750400000,
  "page": 1,
  "page_size": 5,
  "query": null,
  "source_url": "https://www.loc.gov/collections/?fa=original-format:sound+recording&c=5&sp=1&fo=json&at=results,pagination",
  "total": 77
}
```

### Search audio

- Capability: `audio-assets/search_audio`
- Description: Search Library of Congress sound recordings by keyword, optionally inside one collection (e.g. national-jukebox), with a year range and location, subject, contributor and part-of filters; online-playable audio only by default. Pages with continuation. Every result carries title, date, contributors, locations, subjects, collections, a licence object built from the item's own rights statement (code, statement, rights URL, commercial_use, restricted), a ready-to-paste attribution, the page URL and the preview and download URLs loc.gov allows. Accepts loc.gov/audio/?q=... and loc.gov/collections/<slug>/ URLs.
- Instructions: Find historical or ethnographic recordings: "1930s field recordings of work songs", "blues recorded in Texas", "early opera on the National Jukebox", "oral history interviews about the Dust Bowl". Use get_audio for one item's full rights text and files, list_audio_collections to pick a collection.
- Cost: 5 credits per call
- Capability file: [Search audio](https://firecrawl.dev/alexandria/agents/providers/loc-gov/audio-assets/search_audio)

Accepted options:
- `collection` (string): Collection slug from list_audio_collections or a loc.gov/collections/<slug>/ URL, e.g. national-jukebox, john-and-ruby-lomax. Example: `<collection>`
- `continuation` (string): Cursor from a previous call. Example: `<continuation>`
- `contributor` (string): Contributor facet as loc.gov writes it, e.g. lomax, john a. (john avery). Example: `<contributor>`
- `date_from` (number): Earliest year. Example: `1000`
- `date_to` (number): Latest year. Example: `1000`
- `limit` (number): Results per page; default 10. Example: `10`
- `location` (string): Location facet, e.g. texas, mississippi, ireland. Example: `<location>`
- `online_only` (boolean): Default true: only recordings playable online. false also returns campus-only items. Example: `false`
- `part_of` (string): Part-of facet (collection or division name), e.g. american folklife center. Example: `<part_of>`
- `query` (string): Words to search titles, notes, subjects and contributors, e.g. work songs. Example: `<query>`
- `subject` (string): Subject facet, e.g. work songs, blues, interviews. Example: `<subject>`
- `url` (string): A loc.gov/audio/?q=... or loc.gov/collections/<slug>/?q=... URL; its q, fa and dates fill any filter not given. Example: `<url>`

Response schema example:
```json
{
  "count": 5,
  "filters": {
    "collection": null,
    "dates": null,
    "facets": [
      "online-format:audio"
    ]
  },
  "observed_at_ms": 1793750400000,
  "page": 1,
  "page_size": 5,
  "query": "work songs",
  "results": [
    {
      "access_restricted": false,
      "attribution": "\"Cotton Picking Song\" (1939-05-18), John and Ruby Lomax 1939 Southern States Recording Trip (AFC 1939/001), American Folklife Center, Library of Congress, https://www.loc.gov/item/lomaxbib000313/",
      "collections": [
        "the library of congress celebrates the songs of america",
        "southern mosaic: the john and ruby lomax 1939 southern states recording trip",
        "american memory",
        "performing arts encyclopedia",
        "american folklife center"
      ],
      "contributors": [
        "Lomax, John A. (John Avery), 1867-1948 (Collector)",
        "Lomax, Ruby T. (Ruby Terrill) (Collector)",
        "Truvillion, Henry (Performer)"
      ],
      "date": "1939-05-18",
      "download_url": "https://tile.loc.gov/storage-services/media/afc/lomax/afc1939001_02666a1.mp3",
      "duration_seconds": null,
      "format": "mp3",
      "genres": [
        "Music",
        "Songs",
        "Work songs"
      ],
      "id": "lomaxbib000313",
      "license": {
        "attribution_required": false,
        "code": "no_known_restrictions",
        "commercial_use": true,
        "name": "No known restrictions on use or reproduction.",
        "note": null,
        "restricted": false,
        "url": "https://www.loc.gov/legal/"
      },
      "locations": [
        "United States -- Texas -- Newton County -- between Newton and Burkeville"
      ],
      "mime_types": [
        "application/x-audio"
      ],
      "notes": [
        "Venue: Farmhouse of Henry Truvillion",
        "Collector's genre note: \"Cotton Picking and Hauling Song\"",
        "Performance Note: \"Cotton Picking Song\" performed by Henry Truvillion (vocals) at his farmhouse, between Newton and Burkeville, Texas, on May 18, 1939."
      ],
      "page_url": "https://www.loc.gov/item/lomaxbib000313/",
      "preview_url": "https://tile.loc.gov/storage-services/media/ingested/api/loc.afc.afcss39.2666a1.mp3",
      "repository": "American Folklife Center",
      "source_collection": "John and Ruby Lomax 1939 Southern States Recording Trip (AFC 1939/001)",
      "subjects": [
        "United States -- Texas -- Newton County -- between Newton and Burkeville",
        "Music",
        "Songs",
        "Work songs"
      ],
      "title": "Cotton Picking Song"
    },
    {
      "access_restricted": false,
      "attribution": "\"Slow Drag Work Song\" (1939-04-16), John and Ruby Lomax 1939 Southern States Recording Trip (AFC 1939/001), American Folklife Center, Library of Congress, https://www.loc.gov/item/lomaxbib000010/",
      "collections": [
        "the library of congress celebrates the songs of america",
        "southern mosaic: the john and ruby lomax 1939 southern states recording trip",
        "american memory",
        "performing arts encyclopedia",
        "american folklife center"
      ],
      "contributors": [
        "Unidentified performers (Performer)",
        "Lomax, John A. (John Avery), 1867-1948 (Collector)",
        "Lomax, Ruby T. (Ruby Terrill) (Collector)",
        "Woods, Tommy (Performer)"
      ],
      "date": "1939-04-16",
      "download_url": "https://tile.loc.gov/storage-services/media/afc/lomax/afc1939001_02596b1.mp3",
      "duration_seconds": null,
      "format": "mp3",
      "genres": [
        "Music",
        "Songs",
        "Work songs"
      ],
      "id": "lomaxbib000010",
      "license": {
        "attribution_required": false,
        "code": "no_known_restrictions",
        "commercial_use": true,
        "name": "No known restrictions on use or reproduction.",
        "note": null,
        "restricted": false,
        "url": "https://www.loc.gov/legal/"
      },
      "locations": [
        "United States -- Texas -- Brazoria County -- Brazoria"
      ],
      "mime_types": [
        "application/x-audio"
      ],
      "notes": [
        "Venue: Clemens State Farm",
        "Group of convicts",
        "Performance Note: \"Slow Drag Work Song\" performed by Tommy Woods and unidentified performers (vocals) at Clemens State Farm, Brazoria, Texas, on April 16, 1939."
      ],
      "page_url": "https://www.loc.gov/item/lomaxbib000010/",
      "preview_url": "https://tile.loc.gov/storage-services/media/ingested/api/loc.afc.afcss39.2596b1.mp3",
      "repository": "American Folklife Center",
      "source_collection": "John and Ruby Lomax 1939 Southern States Recording Trip (AFC 1939/001)",
      "subjects": [
        "United States -- Texas -- Brazoria County -- Brazoria",
        "Music",
        "Songs",
        "Work songs"
      ],
      "title": "Slow Drag Work Song"
    },
    {
      "access_restricted": false,
      "attribution": "\"Cranberry Song\" (1946-08), The Library of Congress Celebrates the Songs of America, american folklife center, Library of Congress, https://www.loc.gov/item/ihas.200197185/",
      "collections": [
        "american folklife center",
        "the library of congress celebrates the songs of america"
      ],
      "contributors": [
        "Perry, Frances (Singer)",
        "Stratman-Thomas, Helene (Recordist)"
      ],
      "date": "1946-08",
      "download_url": "https://tile.loc.gov/storage-services/public/afc/afcihas-200197185/200197185.mp3",
      "duration_seconds": null,
      "format": "mp3",
      "genres": [
        "sound recording"
      ],
      "id": "ihas.200197185",
      "license": {
        "attribution_required": null,
        "code": "restrictions_may_apply",
        "commercial_use": null,
        "name": "Restrictions may apply.",
        "note": null,
        "restricted": true,
        "url": "https://www.loc.gov/legal/"
      },
      "locations": [
        "United States of America -- Wisconsin"
      ],
      "mime_types": [
        "audio/mpeg"
      ],
      "notes": [
        "Bibliographic History: Published on the Library of Congress LP AFS L55 \"Folk Music from Wisconsin,\" edited by Helene Stratman-Thomas, 1960.",
        "Date: Recorded in August 1946.",
        "Venue: Recorded in Black River Falls, Wisconsin."
      ],
      "page_url": "https://www.loc.gov/item/ihas.200197185/",
      "preview_url": "https://tile.loc.gov/storage-services/public/afc/afcihas-200197185/200197185.mp3",
      "repository": "american folklife center",
      "source_collection": "The Library of Congress Celebrates the Songs of America",
      "subjects": [
        "Work songs",
        "Cranberries",
        "Wisconsin",
        "sound recording",
        "United States of America -- Wisconsin"
      ],
      "title": "Cranberry Song"
    },
    {
      "access_restricted": false,
      "attribution": "\"When the Work's All Done Next Fall\" (1939-05-05), John and Ruby Lomax 1939 Southern States Recording Trip (AFC 1939/001), American Folklife Center, Library of Congress, https://www.loc.gov/item/lomaxbib000192/",
      "collections": [
        "the library of congress celebrates the songs of america",
        "southern mosaic: the john and ruby lomax 1939 southern states recording trip",
        "american memory",
        "performing arts encyclopedia",
        "american folklife center"
      ],
      "contributors": [
        "Lomax, John A. (John Avery), 1867-1948 (Collector)",
        "Lomax, Ruby T. (Ruby Terrill) (Collector)",
        "Taylor, Beal D. (Performer)"
      ],
      "date": "1939-05-05",
      "download_url": "https://tile.loc.gov/storage-services/media/afc/lomax/afc1939001_02641b1.mp3",
      "duration_seconds": null,
      "format": "mp3",
      "genres": [
        "Music",
        "Songs",
        "Cowboy songs"
      ],
      "id": "lomaxbib000192",
      "license": {
        "attribution_required": false,
        "code": "no_known_restrictions",
        "commercial_use": true,
        "name": "No known restrictions on use or reproduction.",
        "note": null,
        "restricted": false,
        "url": "https://www.loc.gov/legal/"
      },
      "locations": [
        "United States -- Texas -- Bandera County -- Medina"
      ],
      "mime_types": [
        "application/x-audio"
      ],
      "notes": [
        "Venue: Home of Beal D. Taylor",
        "Performer referred to elsewhere as Beale D. Taylor",
        "Performance Note: \"When the Work's All Done Next Fall\" performed by Beal D. Taylor (vocals) at his home, near Medina, Texas, on May 5, 1939."
      ],
      "page_url": "https://www.loc.gov/item/lomaxbib000192/",
      "preview_url": "https://tile.loc.gov/storage-services/media/ingested/api/loc.afc.afcss39.2641b1.mp3",
      "repository": "American Folklife Center",
      "source_collection": "John and Ruby Lomax 1939 Southern States Recording Trip (AFC 1939/001)",
      "subjects": [
        "United States -- Texas -- Bandera County -- Medina",
        "Music",
        "Songs",
        "Cowboy songs"
      ],
      "title": "When the Work's All Done Next Fall"
    },
    {
      "access_restricted": false,
      "attribution": "\"Boll Weevil Song\" (1939-05-22), John and Ruby Lomax 1939 Southern States Recording Trip (AFC 1939/001), American Folklife Center, Library of Congress, https://www.loc.gov/item/lomaxbib000348/",
      "collections": [
        "the library of congress celebrates the songs of america",
        "southern mosaic: the john and ruby lomax 1939 southern states recording trip",
        "american memory",
        "performing arts encyclopedia",
        "american folklife center"
      ],
      "contributors": [
        "Lomax, John A. (John Avery), 1867-1948 (Collector)",
        "Lomax, Ruby T. (Ruby Terrill) (Collector)",
        "Valentine, Alf \"Dad\" (Performer)"
      ],
      "date": "1939-05-22",
      "download_url": "https://tile.loc.gov/storage-services/media/afc/lomax/afc1939001_02673b1.mp3",
      "duration_seconds": null,
      "format": "mp3",
      "genres": [
        "Music",
        "Songs",
        "Ballads",
        "Work songs"
      ],
      "id": "lomaxbib000348",
      "license": {
        "attribution_required": false,
        "code": "no_known_restrictions",
        "commercial_use": true,
        "name": "No known restrictions on use or reproduction.",
        "note": null,
        "restricted": false,
        "url": "https://www.loc.gov/legal/"
      },
      "locations": [
        "United States -- Arkansas -- Desha County -- Arkansas City"
      ],
      "mime_types": [
        "application/x-audio"
      ],
      "notes": [
        "Location also known as Gould, Arkansas",
        "Performer referred to elsewhere as Alf \"Chicken\" Valentine",
        "Venue: Cummins State Farm, Camp #9; Stockade",
        "Collector's genre note: \"mixed with blues words\"",
        "Performance Note: \"Boll Weevil Song\" performed by Alf \"Dad\" Valentine (vocals) at Cummins State Farm, Camp #9; Stockade, near Arkansas City, Arkansas, on May 22, 1939."
      ],
      "page_url": "https://www.loc.gov/item/lomaxbib000348/",
      "preview_url": "https://tile.loc.gov/storage-services/media/ingested/api/loc.afc.afcss39.2673b1.mp3",
      "repository": "American Folklife Center",
      "source_collection": "John and Ruby Lomax 1939 Southern States Recording Trip (AFC 1939/001)",
      "subjects": [
        "United States -- Arkansas -- Desha County -- Arkansas City",
        "Music",
        "Songs",
        "Ballads",
        "Work songs"
      ],
      "title": "Boll Weevil Song"
    }
  ],
  "source_url": "https://www.loc.gov/audio/?q=work+songs&fa=online-format:audio&c=5&sp=1&fo=json&at=results,pagination",
  "total": 467
}
```
