When you plug cruz into the computer and open the directory, you'll see 3 folders, all you do is add new folder and name it Music, then add all your mp3's into the folder, then unplug from the computer after it's all done loading. It should then be in your music directory ready to play. I did this today for a friends 6 yr old daughter(Cruz R103), lil bugger got all my mp3's appropriate for her age