I run a soundscape/white noise website (https://ambiph.one) and used FMA to find some really great music for the radio stations, though I did have to do a lot of virtual crate-digging to find it - I found the discovery features very limited.

I had a bit more luck on Bandcamp, which lets artists use Creative Commons licences but strangely doesn't surface that at all as a search filter. I had to resort to searching for "some rights reserved" via Google: https://www.google.com/search?q=inurl%3Abandcamp.com+lofi+%2...