Try SoulSeek, I've been able to find pretty much anything on it, and the only requirements are that some people set it so you have to have a folder be searchable as well, so you can contribute to the community.
Piracy: ꜱᴀɪʟ ᴛʜᴇ ʜɪɢʜ ꜱᴇᴀꜱ
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You have soulseek, ed2k and dc++ too
as a way to search inside communities: https://www.search-lemmy.com/ is in early development but it works surprisingly well usually
Also, on the instance website, when you try to search, you can choose a community.
I'd recommend using something Spotiflyer or some program that converts YouTube playlists to MP3 files and iTunes to transfer them
There is the mega thread on the side bar. Here's the music section maybe it'll have something you are looking for
https://rentry.co/megathread-music
Here's also the freemediaheckyeah wiki