So this is essentially a Popcorn Time-type-thing, but aping Soundcloud rather than Netflix. Cool, I guess?
But also too bad! Because when I first read the headline (and the Github description: "Streaming music player that finds free music for you"), I had imagined this to be something entirely different, and much more interesting to me: a "streaming service" that brings together various types of copyright-free and "abandonware" music.
Think:
• pre-1930s public-domain recordings from Archive.org
• chiptunes from modarchive.org
• songs/albums available for "free" or "pay-what-you-want" on Bandcamp
• "doujin music" (https://doujinstyle.com/, but I'd also include e.g. OCRemix in this category)
• various royalty-free music libraries
• Creative-Commons-licensed AI-generated music (if you like that kind of thing)
• rips of "background music" and "muzak" from long-out-of-business companies who specialized in producing that kind of thing
• free public-shared performances of non-IP-burdened plays / musicals / opera
...but presenting all of that, through a slick, Soundcloud-like interface.
Wouldn't that be neat?