XM is not just like iTunes. The music channels are just like a regular station only the music is better. The channels are set by category/genre. There are NO COMMERCIALS. There is a DJ who comes on every hour or so to tell you what he/she just played and, occasionally, he/she will tell you where the artist you just heard could be seen live in concert that evening. There are not a lot of interuptions. You get 99% music on the music channels. You can even send an email or phone an 800 number to each seperate channel to request a song. I'm sure the audio quality is better than streaming itunes. If you are curious click on the URL I posted on one of my earlier message.