My god after hearing Fleetwood Mac Rumors, Eagles Hotel California and Yes Fragile in 5.1 I am sold. The sound is so clear and solid and to have backround vocals etc sounding like they are coming from behind you kicks ass !! For instance..
The duel leads at the end of Hotel California when Walsh and Felder play together (the most famous part of the solo) has Felder in the left rear speaker and Walsh in the right rear.. The effect with everything else going in the other speakers just makes you feel like your right in the middle of them playing if you close your eyes. I cant imagine how bad ass Escape would sound.... Oh and for the loons.
In most of the 5.1 stuff I have heard the lead vocals end up in the center channel sometimes with very little else mixed with it. You could turn up your center speaker and turn down the others and probably hear Perry singing almost alone. I hope they do this one day. The Houston concert for instance has Perry and Smitty very loud in the center compared to the rest of the band if you in 5.1 mode.

