Can you use any mp3 player with mac besides ipod?

Most mp3 players cannot play iTunes songs because itunes songs are mostly in mp4 format. The iPod is the only player that can play mp4 formats. There are songs that are mp3 formats in itunes, though. Because itunes is its source for music, itunes only recognizes ipods, but if you download correct software for the mp3 player, it should be able to recognize the mp3 player.