I've found that Led Zeppelin sounds pretty harsh on my m22's as well, but I know it's because of the mix, not the speakers. What do you expect when you record your songs in a stairwell and other odd places. I just turn the treble down a little and it's all right. The DVD sounds great though! Dave Matthews sounds incredible. So do the Beatles. These speakers are definitely not forgiving, but play with the settings on your receiver. You can usually get something pretty satisfying with enough tweaking.

Fight on 'SC! Three-Pete Baby!