I just auditioned the 5/6 channels on the 7.1 mix and found this. Nothing spectacular by any means, but interesting none the less.
I am thinking that taking the F-R-C-RS-LS of the 7.1 (tossing 5/6) might make the best 5.1 of the lot!
MOTHER: Piano w/Vocal Bleed
HOLD ON: Ambience
I FOUND OUT: Vocal
WORKING CLASS HERO: Ambience
ISOLATION: Bass Drum, Organ, Piano, Ambient Vocals
REMEMBER: Echo Piano, Out of time Vocals
LOVE: Echo Piano, Ambient Vocals
WELL WELL WELL: Bass Drum, Percussion, Vocals
OH MY LOVE: Ambience
GOD: Piano
GIVE PEACE A CHANCE: Ambience
COLD TURKEY: Silent except for a few sections of guitar only (Look at the wav above and you can "see" the guitar)
INSTANT KARMA: Ambience, but almost full background vocals on the chorus