MusicBrainz is a community-maintained open Database of music metadata. It catalogs artists, releases, recordings, and relationships between them, with a level of detail that commercial databases often lack. Every entry is cross-referenced and linked, so you can trace a song to its album, the album to its release group, and the artist to their collaborations. The data is available under open licenses and can be downloaded or queried through an API.

It's used by developers building music applications, by researchers studying music trends, and by listeners who want accurate information about obscure releases. It's not a streaming service or a discovery tool in the traditional sense, but it's a foundational resource for anyone who cares about music data. The community is dedicated and the database is constantly being improved.