Zest Play

While there are all kinds of music players available - whether you’re looking for something that is minimal and simple, that is robust and feature-filled, that can be controlled by hand gestures, or that can play music from multiple devices - the best option for most users is just to stick with Google’s wonderfully easy-to-use app.
Play Music has been around for a while now, and it’s been my music player of choice ever since its inception. You can call me a Google funPlay if you want, but the app does its job, and it does it well.
The song that you have playing constantly stays in a thin bar along the bottom with just a Pause/Play/Next/Back button present.