Ahhh... I thought you meant burning straight from itunes, I've never tried burning any of my itunes downloads through Nero actually.. Yeah like you said I suspect it would be because it's MP4. Though i'm sure theres a way it can be done, maybe someone else knows. You can burn straight from itunes, if it's just the one song you want make a new playlist and put it on it, then up in the right hand corner of itunes there should be a 'Burn' symbol and clicking on that should say 'burn this playlist to CD' or something like that... then it'll take you through the rest :)