It's not decentralized but anyone can use it (though it's interested)
https://v4vmusic.com/public-tagging-api.html
Untested
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Looks like you have a list of 14 music genres and anyone can use your system to tag with those genres — is that right? Are you tagging artists or songs (or both?)
Artists, tracks, and albums can all be separately tagged. Custom tags can also be created by users.
