Reply #71: I think I've figured this out:

[Initech]

Guns N' Roses (bottom left hand corner)
Sex Pistols (bottom center)
Dead Kennedys (bottom left corner)
Gorillaz (top center)
Pixies (left center)
B-52s (top center)
Queen (bottom center)
Smashing Pumpkins (bottom right)
Alice In Chains (bottom right corner)
Talking Heads (right hand side - the TVs)
King Crimson (right next to the queen)
Nine Inch Nails (right next to the king)
Led Zeppelin (top center)
Madonna (top left corner)
The Eagles (top right corner)
Blur (blurry guy right next to Alice)
Black Flag (on the building above Alice)
Butthole Surfers (the guys carrying surfboards)
Spoon (the giant spoon leaning against the building)
T.A.T.U. (the lesbain chicks making out by the stoplight)
Deep Purple (color of the building in the background)