I LOVE Phonograph. It almost completely lacks sound options, but it's aesthetically beautiful and, as far as I can tell, doesn't use much battery. I'm not really into sound customizing (I listen to a lot of music but don't care much for tweaking sound like that), so the app is perfect for me. And a 10/10 for anyone who likes material design. It's completely free (no paid version or premium IAP), so nothing to lose! Check it out.