What are some places where people can get royalty free / CC0 / copyleft / libre music?

  • https://freemusicarchive.org/genres
  • https://incompetech.com/
  • http://dig.ccmixter.org/
  • OpenGameArt.org
  • https://freesound.org/

and apparently there is a lot more of this
probably better to start pointing to lists rather than to individual sites