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And probably many more

Thanks, jamendo seems not be free of charge though.

Libre.fm is good for discovering CC music. I don’t know if there’s an easy way to search but there are genre tags.

https://libre.fm/listen.php

https://musopen.org/

Has sound recordings and also sheet music. Mostly classical/orchestral.

https://opengameart.org/

https://itch.io/game-assets/free/tag-music

Free Music Archive: https://freemusicarchive.org/

I wonder if there are any sites for collaboratively created songs where the source data for each song is also shared.

http://www.nihilore.com/

That appears to be one person publishing their music under CC-BY. That's nice of them, but not similar to Freesound's massive collection.

I think http://www.ccmixter.org/ would be a more likely candidate, or SoundCloud's search restricted to CC licenses. There are also lots of musicians publishing CC music on Bandcamp, but the site doesn't allow filtering by license. The best approximation I've found is searching "some rights reserved" site:bandcamp.com with DDG and then checking which license the link points to.

slsk