Well I think that'd be obvious, what with Discipline and Echoplex having vocals before The Slip came out.
IT'S GOTTA BE YZ2 LOOK AT THE LYRICS FOR LETTING YOU: the sky is painted black the smoke pours out the stack one hand upon your heart one hand behind your back you train us how to act you keep the fear intact the imminent attack everything is right on track and we are letting you get away we are letting you get away with it upon our plates to feed the dying left to bleed how much we really need your politics of greed the cancer takes ahold the wolf is in the fold our destiny’s been sold we do just what we’re told and we are letting you get away we are letting you get away with it your armies filled with hate believing your charade begin to suffocate for us it’s far too late and we are letting you get away we are letting you get away with it GAHD. I CAN'T STOP TYPING IN CAPS.