Sony Music app is pretty good

PowerAmp gang

I use VLC player..Simple and convinient..

I agree about Musicolet! Descended on it after trying out a dozen or so apps. For sheer flexibility, range of features, and ease of use, I find this to be the best. And of course, as mentioned, no ads or irritating prompts. Also has a dark theme.

Poweramp

Samsung music player for all samsung devices
and Aimp for other devices.

USB Audio )layer Pro and Neutron

[gautxori]

If you like to play music files on shared network locations, check:
https://play.google.com/store/apps/details?id=com.techsoftpl.musicplayer
https://forum.mobilism.org/viewtopic.php?f=1332&t=1692679

Black-Player

Musicolet

https://play.google.com/store/apps/details?id=in.krosbits.musicolet

musicolet one of the offline music player.

https://play.google.com/store/apps/details?id=in.krosbits.musicolet

musicolet one of the offline music player.

poweromp

Rocket Player, 100%

Blackplayer

PowerAmp. I just switched back to Android from iOS and am super-excited to be able to use PowerAmp on my phone again.