https://musopen.org
https://imslp.org
https://freemusicarchive.org
https://www.jamendo.com
https://ccmixter.org
https://freepd.com
https://incompetech.com
https://audionautix.com
For flow-compatible electronica, let me add specifically:
https://netlabels.org/electronic-music/
https://files.scene.org/browse/music/
https://netlabelarchive.org/
https://freemusicarchive.org/label/all/
For flow-compatible electronica, let me add specifically:
https://netlabels.org/electronic-music/
https://files.scene.org/browse/music/
https://netlabelarchive.org/
https://freemusicarchive.org/label/all/