Running Music is a free app for Android devices that lets you listen to high-quality music for free. It has a large collection of various genres of music, from classical to pop, and from rock to electronic. All of them are in MP3 format, and you can even choose between different audio qualities, such as normal, high, and ultra-high.

The app has a simple interface, so you don't have to worry about how to use it. Just open the app, select the genre of music that you want to listen to, and then choose the quality. You can choose from a list of different audio qualities. The best thing about this app is that it has a built-in player, so you don't have to download the mp3 files.

You can also listen to music in the background. This means that you can keep doing your other things and listen to the music in the background. The app has a built-in playlist, so you can add the songs that you want to listen to. It's easy to use, so you don't have to worry about how to use it.