Our purchased music files may not be in the most common mp3 format, but in m4a, for example. This wouldn't be a problem at all, because most music players know many formats, so there's a good chance we can play our music. But what if your favorite player still doesn't know this format and you don't want to switch to another player app? In this case, it will be necessary to convert our files to a format that our player also supports. In this tutorial, we will look at how to convert m4a music files to mp3 on Debian and Ubuntu systems by trying out several methods.