Music purchased from iTunes store is often incompatible with some other common used MP3 Player, such as Sony MP3 Player, Panasonic MP3 Player, etc. ITunes music is under digital rights management (DRM) copy protection. So iTunes music file is called “protected AAC” with the file extension of “.m4p”. In order to be compatible with an MP3 Player, the purchased iTunes music has to be converted into a suitable format. This article will share 4 different methods to convert iTunes music to MP3 on Mac.