No idea what this subreddits rules are on sailing the sea, but I had some luck with a few from a new service I recently downloaded. More niche songs that don’t have a bandcamp release or a self hosted mediafire and are basically just random videos uploaded to NicoNico or YouTube couldn’t be found, but at that point I doubt the song was even produced beyond YouTube-level quality. Also note that most of the songs I’ve been downloading are very old and not QA’d at all, so I don’t have much input on getting new songs.