iTunes (7) sounds really bad! At first I thought it was just the speakers in my Macbook (C2D, 2Ghz), but it sounds really bad through external speakers as well. Any loud or (not even that) bassy bits get really distorted - it's almost unlistenable! Is there some setting I need to change somewhere? I've tried turning sound enhancement on and off and all my songs are at 256kbps. Cheers.