Most of the discussion and sources of content talk about movies and series.
I've been recently looking for psy and techno music, finding FLAC or WAV with active seeders feels like striking gold. It's definitely been a while since I've looked for active torrent sites and it feels more barren than ever.
Edit: Thank you all for all that valuable information. The reddit group really wasn't this helpful and valued making fun over adding real use able knowledge.
I would recommend this website: https://free-mp3-download.net/ which is also listed in the megathread.
It takes music from Deezer in HIFI quality (FLAC 16/44). You can either download it as FLAC (lossless, but also large), MP3 320K or MP3 128K. Even the same bitrate will give you better quality since you're not re-encoding from lossy source.
From my experience, it doesn't accept characters like apostrophes in the search box. Hyphens are fine.
I also found this one: http://flacmusicfinder.com/
It only has links to files uploaded by many users, so your mileage may vary. But I have gotten a real FLAC from there (checked in Aspect Pro), though I only tried it once because I couldn't find some song on the aforementioned site.