Music apps are designed to play different kinds of music from your phone’s playlist or from an online music library. When you search for music apps, you will see several apps displayed on your phone screen.
Because there is a rapid increase every year in the number of these apps, if we look back a few years ago, if someone wanted to listen to music, he/she had to buy some CDs of music and put them in CD players to listen to music. But these days you don’t need to do anything like this. You can listen to any track on your phone from these music apps.