Links
This is a list of netlabels that use (on most of their releases) Creative Commons licenses allowing for derivative works. Double-check the license for the specific release before sampling from them!
If you run, or know of a netlabel that should be on this list because they use CC deriv-friendly licensing, leave a comment, here and I’ll add it!
This is currently not in any order, maybe I’ll alphabetize it if I’m bored someday.
Derivative (yes, I’m linking to this very netlabel, well: it is derivative friendly!)
13 Sources for Free Public Domain and CC0 Licensed Images
The Easy Pace – Highlighting remixable releases across genres, with a focus on experimental music (and therefore some posts in the experimental realm are non-remixable — check those licenses)
Search on SoundCloud for modifiable / downloadable tracks
Music Manumit podcast (the music portions of this podcast only feature music with remixable, derivative-allowing CC licenses, the talk portions of the podcast center around musical use of CC licenses – almost all content on the podcast is license CC BY SA)
The Public Domain Review /audio