A free program for Android, by Prime Dev Studio.

Atom Music Player is a music player for Android devices. It is designed to be a simple, easy-to-use player for any audio files. 

You can add, remove, or change the order of your playlist, as well as the type of music (rock, pop, jazz, blues, folk, heavy metal, hip hop, etc). You can also create a folder to keep your music organized. 

Atom Music Player can play multiple audio files at the same time. It supports the bass booster and the virtualizer. The bass booster can increase the bass in your audio files. 

You can also set up sleep timers to automatically turn off when it’s time to sleep.