Came across this in-development app, that seems really clean. Is available for iOS/MacOS already. It will be available on PlayStore and Fdroid eventually, but there is an APK for those who want to try it out.
Github Project: https://github.com/avdept/JellyBoxPlayer
Screenshots
Findroid/Finamp? Quite robust.
Link: https://github.com/jmshrv/finamp
Finamp is my daily driver for my music needs on the Go I can only recommand!
Can recommend Symphonium. Costs a few bucks but its very very rich in features
Symfonium is my best buy of the year I think tho