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This is a pretty low effort question, you know about F-Droid …so use the search function.
Some examples are funkwhale (for playing self-hosted content), or MusicPiped which seems to fetch from youtube.
For results on F-Droid app you can click “about” and then “source code” which normally links to the projects github page
They also have UltraSonic if wants to use servers with Subsonic API.
I use an instance of InvidioUs to stream YouTube music.
NewPipe does a great job. It uses YouTube’s library which includes YouTube music.
