Handboekje

Muziek

ccMixter

http://ccmixter.org/
ccMixter
(link 219)

Free Music Archive

http://freemusicarchive.org/
It's not just free music; it's good music.
(link 212)

https://archive.org/details/audio
This library contains recordings ranging from alternative news programming, to Grateful Dead concerts, to Old Time Radio shows, to book and poetry readings, to original music uploaded by our users. Many of these audios and MP3s are available for free download. Check our FAQ for more information.
(link 215)

Bandcamp creative commons

https://bandcamp.com/tag/creative-commons
Bandcamp creative commons
(link 214)

Ektoplazm Free Music Portal

https://ektoplazm.com/
Ektoplazm, the world's #1 source for free and legal psytrance, techno, and downtempo music in MP3, FLAC, and WAV format.
(link 218)