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.
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
I'd recommend using something Spotiflyer or some program that converts YouTube playlists to MP3 files and iTunes to transfer them