Music Ontology
RDF vocabulary for music — artists, albums, tracks, performances, compositions, and audio signals.
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Where this one tends to earn its keep.
Music knowledge graph construction
Music recommendation systems
Audio metadata interoperability
Music information retrieval research
I haven't checked this label against the actual licence text — it's the catalogue's original guess. Check the ontology's own site before you rely on it.
Others worth a look in Media & Culture.