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

• https://alternativeto.net/software/ccmixter/
• https://alternativeto.net/software/incompetech/
• Makeuseof - The 14 Best Sites to Find Free Creative Commons Music