Another option: I used zotify to rip my playlists directly from Spotify and then transferred to my phone

Oops am blind and wear sunglasses inside. That makes me incapable of having manners. /s

I just use Firefox with uBlock origin. Have never had an ad, can listen with locked screen and it basically just works.

I think Grayjay can but I haven’t had as much luck with that playing kick. (It works fantastically for YouTube)

Rusty cage built a massive one a couple years ago

https://www.youtube.com/watch?v=SakGM31nfec