Okay, no they won't be technically compatible. I use Limewire to download and then I move it into itunes, so I'm thinking Napster would probably work similarly. I go into the folder for Limewire and then move the songs into a new music folder that I created called itunes. Then you can go into itunes and select File...Add New Folder to Library. You just select the folder where you've moved your music and it copies it into itunes!