MusicBrainz Identifier

The MusicBrainz Identifier is used by the MusicBrainz project (an online encyclopedia and database of music) as the unique identifier for each musical work, recording, artist, or other thing tracked in the database.

They are 36 characters long; an example is, the MusicBrainz identifier for the song "Bohemian Rhapsody" by Queen.

They can be turned into URIs by prefixing the MusicBrainz server and resource type, like.

Links

 * Description in MusicBrainz site