Easier question to answer: how don’t I listen to music:
Out of my phones speaker.
I’ve got a few pairs of earbuds, headphones, headphone dacs, and 2.0 system attached to my TV, Oh and the “premium” audio system my Prius came with. Spotify, Apple Music, Plex… wired, wireless
Were you looking for something specific?
I hop around periodically through iOS options, I’m using 2 main ones right now: Arctic and Avelon
I think Arctic is the best