MusicBrainz API/Examples: Difference between revisions

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The main web service is the [[Development/XML Web Service/Version_2|XML Web Service]]. This page is about the (beta) '''JSON''' format of that web service.
This document describes the proposed JSON output, using example queries and the responses I am proposing.
Getting a JSON response will require setting the Accept header to "application/json".


This document describes the proposed JSON output, using example queries and the responses I am proposing. To get a JSON response you can either set the Accept header to "application/json" or add fmt=json to the query string (if both are set, fmt= takes precedence).
The most important difference with the JSON response currently used internally by the search server is
that all "-list" elements are replaced with javascript arrays, using an english plural as the key.
So { "tag-list": { "tag": [ ... ] } } becomes { "tags": [ ... ] }.


Some notable differences compared to the JSON response currently used internally by the search server:
==Artist==
# all "-list" elements are replaced with javascript arrays, using an english plural as the key. So { "tag-list": { "tag": [ ... ] } } becomes { "tags": [ ... ] }.
# the "name-credit" key inside an "artist-credit" is removed.


Some of the responses below have some fields omitted to keep the examples shorter, in the actual webservice obviously this data will be included.
Request: http://musicbrainz.org/ws/2/artist/5b11f4ce-a62d-471e-81fc-a69a8278c7da?inc=aliases

==Beta==

WARNING: This web service is available on the production server (musicbrainz.org/ws/2/), but should be not be considered stable. There are still some [http://tickets.musicbrainz.org/browse/MBS-3072 known bugs], and we may decide to make some small changes to the API as documented below. If you have any feedback comment on the [http://tickets.musicbrainz.org/browse/MBS-3072 ticket] or contact warp through e-mail or irc. When we mark the API as stable we will be very reluctant to make any changes, so now is the time if you have any feedback or suggestions.

==Lookup requests==
===Artist===

Request: http://musicbrainz.org/ws/2/artist/5b11f4ce-a62d-471e-81fc-a69a8278c7da?inc=aliases&fmt=json<br />
Response:
Response:


<code>
<code>
{
{
"id": "5b11f4ce-a62d-471e-81fc-a69a8278c7da",
"artist": {
"name": "Nirvana",
"id": "5b11f4ce-a62d-471e-81fc-a69a8278c7da"
"name": "Nirvana",
"sort-name": "Nirvana"
"sort-name": "Nirvana"
"type": "Group",
"type": "Group",
"country": "US",
"country": "US",
"disambiguation": "90s US grunge band",
"life-span": {
"disambiguation": "90s US grunge band",
"life-span": {
"ended": true,
"ended": true,
"begin": "1988-02",
"begin": "1988-02",
"end": "1994-04-05"
},
"end": "1994-04-05"
"aliases": [ { "name": "Nirvana US", "sort-name": "Nirvana US" } ]]
},
"aliases": { "name": "Nirvana US", "sort-name": "Nirvana US" },
}
}
}
</code>
</code>


Request: http://musicbrainz.org/ws/2/artist/05cbaf37-6dc2-4f71-a0ce-d633447d90c3?inc=aliases+tags+ratings
Request: http://musicbrainz.org/ws/2/artist/05cbaf37-6dc2-4f71-a0ce-d633447d90c3?inc=aliases+tags+ratings&fmt=json<br />
Response:
Response:


<code>
<code>
{
{
"id": "05cbaf37-6dc2-4f71-a0ce-d633447d90c3",
"artist": {
"id": "05cbaf37-6dc2-4f71-a0ce-d633447d90c3",
"name": "東方神起",
"name": "\u6771\u65b9\u795e\u8d77",
"sort-name": "TVXQ",
"sort-name": "TVXQ",
"country": null,
"type": "Group",
"disambiguation": null,
"life-span": {
"type": "Group",
"ended": false,
"life-span": { "ended": false, "begin": "2003" },
"begin": "2003"
"aliases": [
},
{ "name": "DBSK", "sort-name": "DBSK" },
{ "name": "Tohoshinki", "sort-name": "Tohoshinki", "locale": "ja", "primary": false },
"aliases": [
{ "name": "DBSK", "sort-name": "DBSK" },
{ "name": "동방신기", "sort-name": "동방신기", "locale": "ko_KR", "primary": true }
],
{ "name": "Tohoshinki", "sort-name": "Tohoshinki", "locale": "ja", "primary": true },
"tags": [
{ "name": "\ub3d9\ubc29\uc2e0\uae30", "sort-name": "\ub3d9\ubc29\uc2e0\uae30", "locale": "ko_KR", "primary": true }
],
{ "count": 1, "name": "kpop" },
"tags": [
{ "count": 1, "name": "jpop" },
{ "count": 1, "name": "kpop" },
{ "count": 1, "name": "cpop" }
],
{ "count": 1, "name": "jpop" },
{ "count": 1, "name": "cpop" }
"rating": { "votes-count": 8, "value": 3.9 }
],
"rating": { "votes-count": 8, "value": 3.9 }
}
}
}
</code>
</code>


==Label==
===Label===


Request: http://musicbrainz.org/ws/2/label/46f0f4cd-8aab-4b33-b698-f459faf64190?inc=aliases
Request: http://musicbrainz.org/ws/2/label/46f0f4cd-8aab-4b33-b698-f459faf64190?inc=aliases&fmt=json<br />
Response:
Response:


<code>
<code>
{
{
"id": "46f0f4cd-8aab-4b33-b698-f459faf64190",
"label": {
"id": "46f0f4cd-8aab-4b33-b698-f459faf64190",
"name": "Warp Records",
"name": "Warp Records",
"sort-name": "Warp Records",
"sort-name": "Warp Records",
"label-code": 2070,
"label-code": 2070,
"type": "Original Production",
"type": "Original Production",
"country": "GB",
"country": "GB",
"life-span": { "ended": false, "begin": "1989" },
"life-span": {
"tags": [ { "count": 2, "name": "electronic" } ],
"ended": false,
"disambiguation": null,
}
"begin": "1989"
</code>

Request: http://musicbrainz.org/ws/2/label/f49e877d-df8d-4a28-bbe1-689d12fc7d91?inc=aliases&fmt=json<br />
Response:

<code>
{
"id": "f49e877d-df8d-4a28-bbe1-689d12fc7d91"
"name": "AVEX ENTERTAINMENT INC.",
"sort-name": "AVEX ENTERTAINMENT INC.",
"type": "Production",
"country": "JP",
"disambiguation": "avex's Japanese music production",
"life-span": { "ended": false },
"aliases": [
{ "name": "AVEX MARKETING", "sort-name": "AVEX MARKETING" },
{ "name": "avex marketing", "sort-name": "avex marketing" },
{
"name": "エイベックス・エンタテインメント",
"sort-name": "エイベックス・エンタテインメント"
}
]
}
</code>

===Recording===

Request: http://musicbrainz.org/ws/2/recording/fcbcdc39-8851-4efc-a02a-ab0e13be224f?inc=artist-credits+isrcs+releases&fmt=json<br />
Response:

<code>
{
"id": "fcbcdc39-8851-4efc-a02a-ab0e13be224f",
"title": "LAST ANGEL",
"disambiguation": "video",
"artist-credit": [
{
"name": "倖田來未",
"joinphrase": " feat. ",
"artist": {
"id": "455641ea-fff4-49f6-8fb4-49f961d8f1ac",
"name": "倖田來未",
"sort-name": "Koda, Kumi",
"disambiguation": null
}
},
{
"name": "東方神起",
"artist": {
"id": "05cbaf37-6dc2-4f71-a0ce-d633447d90c3",
"name": "東方神起",
"sort-name": "TVXQ",
"disambiguation": null
},
"joinphrase": ""
}
],
"isrcs": [ "JPB600760301" ],
"length": 228106,
"releases": [
{
"id": "abcd76db-7d5f-3eb7-b386-051c97bfe2e4",
"title": "Kingdom",
/* some properties omitted to keep this example shorter. */
}
]
}
</code>

===Release===

Request: http://musicbrainz.org/ws/2/release/59211ea4-ffd2-4ad9-9a4e-941d3148024a?inc=artist-credits+labels+discids+recordings&fmt=json<br/>
Response:

<code>
{
"id": "59211ea4-ffd2-4ad9-9a4e-941d3148024a",
"title": "æ³o & h³æ",
"date": "2003-12-04",
"text-representation": { "language": "eng", "script": "Latn" },
"country": "GB",
"status": "Official",
"quality": "normal",
"release-group": {
"id": "bb5622c1-65b2-3bc4-83e6-0dcaa56abaf2",
"primary-type": "EP"
},
"artist-credit": [
{
"joinphrase": " & ",
"name": "Autechre",
"artist": {
"id": "410c9baf-5469-44f6-9852-826524b80c61",
"name": "Autechre",
"sort-name": "Autechre",
"disambiguation": null
}
},
{
"name": "The Hafler Trio",
"joinphrase": "",
"artist": {
"id": "146c01d0-d3a2-44c3-acb5-9208bce75e14",
"sort-name": "Hafler Trio, The",
"name": "The Hafler Trio",
"disambiguation": null
}
}
],
"label-info": [
{
"label": {
"id": "a0759efa-f583-49ea-9a8d-d5bbce55541c",
"name": "Phonometrography",
"sort-name": "Phonometrography",
"label-code": null,
"disambiguation": null
},
"catalog-number": "pgram002"
}
],
"media": [
{
"track-offset": 0,
"track-count": 1,
"title": "æ³o",
"format": "CD",
"discids": [
{ "id": "nN2g3a0ZSjovyIgK3bJl6_.j8C4-", "sectors": 73241 }
],
"tracks": [
{
"number": "1",
"length": 974546,
"title": "æ³o",
"recording": { /* recording data omitted for this example. */ },
"artist-credit": [ /* as on release, not repeated in this example. */ ]
}
]
},
{
"track-offset": 0,
"track-count": 1,
"title": "h³æ",
"format": "CD",
"discids": [
{ "id": "aSHvkMnq2jZVFEK.DmSPbvN_f54-", "sectors": 69341 }
],
"tracks": [
{
"number": "1",
"length": 922546,
"title": "h³æ",
"recording": { /* recording data omitted for this example. */ },
"artist-credit": [ /* as on release, not repeated in this example. */ ]
}
]
}
],
"barcode": null,
"disambiguation": null,
"packaging": null,
"asin": null
}
</code>

===Release Group===

Request: http://musicbrainz.org/ws/2/release-group/c9fdb94c-4975-4ed6-a96f-ef6d80bb7738?inc=artist-credits+releases&fmt=json<br />
Response:

<code>
{
"id": "c9fdb94c-4975-4ed6-a96f-ef6d80bb7738",
"first-release-date": "2012-05-22",
"title": "The Lost Tape",
"artist-credit": [
"name": "50 Cent",
"joinphrase": "",
"artist": {
"id": "8e68819d-71be-4e7d-b41d-f1df81b01d3f",
"name": "50 Cent",
"sort-name": "50 Cent",
"disambiguation": null
}
],
"primary-type": "Album",
"disambiguation": null,
"secondary-types": [ "Mixtape/Street" ],
"releases": [
{
"id": "2ec84eb6-ab92-4ac3-9720-32ad84c34f11",
"title": "The Lost Tape",
/* some properties omitted to keep this example shorter. */
}
]
}
</code>

===Work===

Request: http://musicbrainz.org/ws/2/work/b1df2cf3-69a9-3bc0-be44-f71e79b27a22?fmt=json<br />
Response:

<code>
{
"id": "b1df2cf3-69a9-3bc0-be44-f71e79b27a22",
"title": "HELLO! また会おうね",
"language": "jpn",
"iswcs": [ "T-101.690.320-9" ]
}
</code>

==Browse Requests==

Browse requests return a toplevel object with offset and count properties to
help with paging, and a property for the requested entity.
The key for this property will be the english plural of the entity, so:
artists, labels, recordings, releases, release-groups or works.

Request: http://musicbrainz.org/ws/2/release?label=47e718e1-7ee4-460c-b1cc-1192a841c6e5&offset=12&limit=2&fmt=json<br />
Response:

<code>
{
"releases": [
{
"id": "0b405ea7-8785-402f-bcf7-d55f5000dc3e",
"title": "Wintertunes"
/* some properties omitted to keep this example shorter. */
},
},
{
"tags": [ { "count": 2, "name": "electronic" } ]
"id": "7eb37a3a-646d-4501-a373-e9071186b88d",
}
"title": "Adventure Magic Supreme Journey Music"
/* some properties omitted to keep this example shorter. */
}
],
"release-offset": 12,
"release-count": 48
}
}
</code>
</code>


==Relationships==
Request: http://musicbrainz.org/ws/2/label/f49e877d-df8d-4a28-bbe1-689d12fc7d91?inc=aliases

Request: http://musicbrainz.org/ws/2/release/275b01eb-8551-47ff-bd6b-2d142b4bf422?inc=url-rels&fmt=json<br />
Response:
Response:


<code>
<code>
{
{
"id": "275b01eb-8551-47ff-bd6b-2d142b4bf422",
"label": {
"title": "Kraftwerk Kover Kollection, Volume 1",
"id": "f49e877d-df8d-4a28-bbe1-689d12fc7d91"
"name": "AVEX ENTERTAINMENT INC.",
"quality": "normal",
"sort-name": "AVEX ENTERTAINMENT INC.",
"text-representation": { "language": "eng", "script": "Latn" },
"type": "Production",
"date": "2012",
"country": "JP",
"relations": [
{
"disambiguation": "avex's Japanese music production",
"life-span": { "ended": false },
"direction": "backward",
"aliases": [
"type": "download for free",
"url": "http://soundcloud.com/strictly/kraftwerk-kover-kollection-vol"
{ "name": "AVEX MARKETING", "sort-name": "AVEX MARKETING" },
}
{ "name": "avex marketing", "sort-name": "avex marketing" },
{
],
"country": null,
"name": "\u30a8\u30a4\u30d9\u30c3\u30af\u30b9\u30fb\u30a8\u30f3\u30bf\u30c6\u30a4\u30f3\u30e1\u30f3\u30c8",
"status": null,
"sort-name": "\u30a8\u30a4\u30d9\u30c3\u30af\u30b9\u30fb\u30a8\u30f3\u30bf\u30c6\u30a4\u30f3\u30e1\u30f3\u30c8"
}
"barcode": null,
]
"disambiguation": null,
"packaging": null,
}
"asin": null
}
}
</code>
</code>

Request: http://musicbrainz.org/ws/2/work/b1df2cf3-69a9-3bc0-be44-f71e79b27a22?inc=artist-rels+recording-rels&fmt=json<br />
Response:

<code>
{
"id": "b1df2cf3-69a9-3bc0-be44-f71e79b27a22",
"title": "HELLO! また会おうね",
"language": "jpn",
"iswcs": [ "T-101.690.320-9" ],
"relations": [
{
"direction": "backward",
"type": "composer",
"artist": {
"id": "d997d399-355e-4c49-9c7b-75a93d76bc0e",
"name": "つんく♂",
"sort-name": "Tsunku",
"disambiguation": null
}
},
{
"direction": "backward",
"type": "lyricist",
"artist": {
"id": "d997d399-355e-4c49-9c7b-75a93d76bc0e",
"name": "つんく♂",
"sort-name": "Tsunku",
"disambiguation": null
}
},
{
"direction": "backward",
"type": "performance",
"recording": {
"id": "487cac92-eed5-4efa-8563-c9a818079b9a",
"title": "HELLO! また会おうね (7人祭 version)",
"length": 283600,
"disambiguation": null
}
},
{
"type": "performance",
"direction": "backward",
"recording": {
"id": "fd3061c1-cb9a-4698-bc5f-f6e0e6a36272",
"title": "HELLO! また会おうね (20人祭 version)",
"length": 283600,
"disambiguation": "PV"
}
}
]
}

Revision as of 06:17, 30 June 2015

The main web service is the XML Web Service. This page is about the (beta) JSON format of that web service.

This document describes the proposed JSON output, using example queries and the responses I am proposing. To get a JSON response you can either set the Accept header to "application/json" or add fmt=json to the query string (if both are set, fmt= takes precedence).

Some notable differences compared to the JSON response currently used internally by the search server:

  1. all "-list" elements are replaced with javascript arrays, using an english plural as the key. So { "tag-list": { "tag": [ ... ] } } becomes { "tags": [ ... ] }.
  2. the "name-credit" key inside an "artist-credit" is removed.

Some of the responses below have some fields omitted to keep the examples shorter, in the actual webservice obviously this data will be included.

Beta

WARNING: This web service is available on the production server (musicbrainz.org/ws/2/), but should be not be considered stable. There are still some known bugs, and we may decide to make some small changes to the API as documented below. If you have any feedback comment on the ticket or contact warp through e-mail or irc. When we mark the API as stable we will be very reluctant to make any changes, so now is the time if you have any feedback or suggestions.

Lookup requests

Artist

Request: http://musicbrainz.org/ws/2/artist/5b11f4ce-a62d-471e-81fc-a69a8278c7da?inc=aliases&fmt=json
Response:

{
    "id": "5b11f4ce-a62d-471e-81fc-a69a8278c7da",
    "name": "Nirvana",
    "sort-name": "Nirvana"
    "type": "Group",
    "country": "US",
    "disambiguation": "90s US grunge band",
    "life-span": {
        "ended": true,
        "begin": "1988-02",
        "end": "1994-04-05"
    },
    "aliases": [ { "name": "Nirvana US", "sort-name": "Nirvana US" } ]]
}

Request: http://musicbrainz.org/ws/2/artist/05cbaf37-6dc2-4f71-a0ce-d633447d90c3?inc=aliases+tags+ratings&fmt=json
Response:

{
    "id": "05cbaf37-6dc2-4f71-a0ce-d633447d90c3",
    "name": "東方神起",
    "sort-name": "TVXQ",
    "country": null,
    "disambiguation": null,
    "type": "Group",
    "life-span": { "ended": false, "begin": "2003" },
    "aliases": [
        { "name": "DBSK", "sort-name": "DBSK" },
        { "name": "Tohoshinki", "sort-name": "Tohoshinki", "locale": "ja", "primary": false },
        { "name": "동방신기", "sort-name": "동방신기", "locale": "ko_KR", "primary": true }
    ],
    "tags": [
        { "count": 1, "name": "kpop" },
        { "count": 1, "name": "jpop" },
        { "count": 1, "name": "cpop" }
    ],
    "rating": { "votes-count": 8, "value": 3.9 }
}

Label

Request: http://musicbrainz.org/ws/2/label/46f0f4cd-8aab-4b33-b698-f459faf64190?inc=aliases&fmt=json
Response:

{
    "id": "46f0f4cd-8aab-4b33-b698-f459faf64190",
    "name": "Warp Records",
    "sort-name": "Warp Records",
    "label-code": 2070,
    "type": "Original Production",
    "country": "GB",
    "life-span": { "ended": false, "begin": "1989" },
    "tags": [ { "count": 2, "name": "electronic" } ],
    "disambiguation": null,
}

Request: http://musicbrainz.org/ws/2/label/f49e877d-df8d-4a28-bbe1-689d12fc7d91?inc=aliases&fmt=json
Response:

{
    "id": "f49e877d-df8d-4a28-bbe1-689d12fc7d91"
    "name": "AVEX ENTERTAINMENT INC.",
    "sort-name": "AVEX ENTERTAINMENT INC.",
    "type": "Production",
    "country": "JP",
    "disambiguation": "avex's Japanese music production",
    "life-span": { "ended": false },
    "aliases": [
        { "name": "AVEX MARKETING", "sort-name": "AVEX MARKETING" },
        { "name": "avex marketing", "sort-name": "avex marketing" },
        {
            "name": "エイベックス・エンタテインメント",
            "sort-name": "エイベックス・エンタテインメント"
        }
    ]
}

Recording

Request: http://musicbrainz.org/ws/2/recording/fcbcdc39-8851-4efc-a02a-ab0e13be224f?inc=artist-credits+isrcs+releases&fmt=json
Response:

{
    "id": "fcbcdc39-8851-4efc-a02a-ab0e13be224f",
    "title": "LAST ANGEL",
    "disambiguation": "video",
    "artist-credit": [
        {
            "name": "倖田來未",
            "joinphrase": " feat. ",
            "artist": {
                "id": "455641ea-fff4-49f6-8fb4-49f961d8f1ac",
                "name": "倖田來未",
                "sort-name": "Koda, Kumi",
                "disambiguation": null
            }
        },
        {
            "name": "東方神起",
            "artist": {
                "id": "05cbaf37-6dc2-4f71-a0ce-d633447d90c3",
                "name": "東方神起",
                "sort-name": "TVXQ",
                "disambiguation": null
            },
            "joinphrase": ""
        }
    ],
    "isrcs": [ "JPB600760301" ],
    "length": 228106,
    "releases": [
        {
            "id": "abcd76db-7d5f-3eb7-b386-051c97bfe2e4",
            "title": "Kingdom",
            /* some properties omitted to keep this example shorter. */
        }
    ]
}

Release

Request: http://musicbrainz.org/ws/2/release/59211ea4-ffd2-4ad9-9a4e-941d3148024a?inc=artist-credits+labels+discids+recordings&fmt=json
Response:

{
    "id": "59211ea4-ffd2-4ad9-9a4e-941d3148024a",
    "title": "æ³o & h³æ",
    "date": "2003-12-04",
    "text-representation": { "language": "eng", "script": "Latn" },
    "country": "GB",
    "status": "Official",
    "quality": "normal",
    "release-group": {
        "id": "bb5622c1-65b2-3bc4-83e6-0dcaa56abaf2",
        "primary-type": "EP"
    },
    "artist-credit": [
        {
            "joinphrase": " & ",
            "name": "Autechre",
            "artist": {
                "id": "410c9baf-5469-44f6-9852-826524b80c61",
                "name": "Autechre",
                "sort-name": "Autechre",
                "disambiguation": null
            }
        },
        {
            "name": "The Hafler Trio",
            "joinphrase": "",
            "artist": {
                "id": "146c01d0-d3a2-44c3-acb5-9208bce75e14",
                "sort-name": "Hafler Trio, The",
                "name": "The Hafler Trio",
                "disambiguation": null
            }
        }
    ],
    "label-info": [
        {
            "label": {
                "id": "a0759efa-f583-49ea-9a8d-d5bbce55541c",
                "name": "Phonometrography",
                "sort-name": "Phonometrography",
                "label-code": null,
                "disambiguation": null
            },
            "catalog-number": "pgram002"
        }
    ],
    "media": [
        {
            "track-offset": 0,
            "track-count": 1,
            "title": "æ³o",
            "format": "CD",
            "discids": [
                { "id": "nN2g3a0ZSjovyIgK3bJl6_.j8C4-", "sectors": 73241 }
            ],
            "tracks": [
                {
                    "number": "1",
                    "length": 974546,
                    "title": "æ³o",
                    "recording": { /* recording data omitted for this example. */ },
                    "artist-credit": [ /* as on release, not repeated in this example. */ ]
                }
            ]
        },
        {
            "track-offset": 0,
            "track-count": 1,
            "title": "h³æ",
            "format": "CD",
            "discids": [
                { "id": "aSHvkMnq2jZVFEK.DmSPbvN_f54-", "sectors": 69341 }
            ],
            "tracks": [
                {
                    "number": "1",
                    "length": 922546,
                    "title": "h³æ",
                    "recording": { /* recording data omitted for this example. */ },
                    "artist-credit": [ /* as on release, not repeated in this example. */ ]
                }
            ]
        }
    ],
    "barcode": null,
    "disambiguation": null,
    "packaging": null,
    "asin": null
}

Release Group

Request: http://musicbrainz.org/ws/2/release-group/c9fdb94c-4975-4ed6-a96f-ef6d80bb7738?inc=artist-credits+releases&fmt=json
Response:

{
    "id": "c9fdb94c-4975-4ed6-a96f-ef6d80bb7738",
    "first-release-date": "2012-05-22",
    "title": "The Lost Tape",
    "artist-credit": [
        "name": "50 Cent",
        "joinphrase": "",
        "artist": {
            "id": "8e68819d-71be-4e7d-b41d-f1df81b01d3f",
            "name": "50 Cent",
            "sort-name": "50 Cent",
            "disambiguation": null
        }
    ],
    "primary-type": "Album",
    "disambiguation": null,
    "secondary-types": [ "Mixtape/Street" ],
    "releases": [
        {
            "id": "2ec84eb6-ab92-4ac3-9720-32ad84c34f11",
            "title": "The Lost Tape",
            /* some properties omitted to keep this example shorter. */
        }
    ]
}

Work

Request: http://musicbrainz.org/ws/2/work/b1df2cf3-69a9-3bc0-be44-f71e79b27a22?fmt=json
Response:

{
    "id": "b1df2cf3-69a9-3bc0-be44-f71e79b27a22",
    "title": "HELLO! また会おうね",
    "language": "jpn",
    "iswcs": [ "T-101.690.320-9" ]
}

Browse Requests

Browse requests return a toplevel object with offset and count properties to help with paging, and a property for the requested entity. The key for this property will be the english plural of the entity, so: artists, labels, recordings, releases, release-groups or works.

Request: http://musicbrainz.org/ws/2/release?label=47e718e1-7ee4-460c-b1cc-1192a841c6e5&offset=12&limit=2&fmt=json
Response:

{
    "releases": [
       {
           "id": "0b405ea7-8785-402f-bcf7-d55f5000dc3e",
           "title": "Wintertunes"
           /* some properties omitted to keep this example shorter. */
       },
       {
           "id": "7eb37a3a-646d-4501-a373-e9071186b88d",
           "title": "Adventure Magic Supreme Journey Music"
           /* some properties omitted to keep this example shorter. */
       }
    ],
    "release-offset": 12,
    "release-count": 48
}

Relationships

Request: http://musicbrainz.org/ws/2/release/275b01eb-8551-47ff-bd6b-2d142b4bf422?inc=url-rels&fmt=json
Response:

{
    "id": "275b01eb-8551-47ff-bd6b-2d142b4bf422",
    "title": "Kraftwerk Kover Kollection, Volume 1",
    "quality": "normal",
    "text-representation": { "language": "eng", "script": "Latn" },
    "date": "2012",
    "relations": [
        {
            "direction": "backward",
            "type": "download for free",
            "url": "http://soundcloud.com/strictly/kraftwerk-kover-kollection-vol"
        }
    ],
    "country": null,
    "status": null,
    "barcode": null,
    "disambiguation": null,
    "packaging": null,
    "asin": null
}

Request: http://musicbrainz.org/ws/2/work/b1df2cf3-69a9-3bc0-be44-f71e79b27a22?inc=artist-rels+recording-rels&fmt=json
Response:

{
  "id": "b1df2cf3-69a9-3bc0-be44-f71e79b27a22",
  "title": "HELLO! また会おうね",
  "language": "jpn",
  "iswcs": [ "T-101.690.320-9" ],
  "relations": [
        {
            "direction": "backward",
            "type": "composer",
            "artist": {
                "id": "d997d399-355e-4c49-9c7b-75a93d76bc0e",
                "name": "つんく♂",
                "sort-name": "Tsunku",
                "disambiguation": null
            }
        },
        {
            "direction": "backward",
            "type": "lyricist",
            "artist": {
                "id": "d997d399-355e-4c49-9c7b-75a93d76bc0e",
                "name": "つんく♂",
                "sort-name": "Tsunku",
                "disambiguation": null
            }
        },
        {
            "direction": "backward",
            "type": "performance",
            "recording": {
                "id": "487cac92-eed5-4efa-8563-c9a818079b9a",
                "title": "HELLO! また会おうね (7人祭 version)",
                "length": 283600,
                "disambiguation": null
            }
        },
        {
            "type": "performance",
            "direction": "backward",
            "recording": {
                "id": "fd3061c1-cb9a-4698-bc5f-f6e0e6a36272",
                "title": "HELLO! また会おうね (20人祭 version)",
                "length": 283600,
                "disambiguation": "PV"
            }
        }
    ]
}