You register as a new person, and it's like a super radio station thingy. Like, to create your radio station, you would type in, for example, "Mariah Carey," and it starts to play songs back to back (no interuptions!) that are Mariah Carey songs WITH other songs that are similar. Too cool! Try it, you'll be more addicted then playing your itunes playlists when you're on you're working on your computer :). Right now I'm listening to "Christina Aquilera" radio and it's awe-SOME!