Sgt Pepper gets all the praise as 'revolutionary', but why? Revolver was the record that introduced ADT, variable tape speed, tape loops, chamber musicians, backwards guitar, Indian music and general studio trickery. All Sgt Pepper did was take what had been achieved on Revolver and refined it a bit further. But Pepper has that crazy cover right? Well look at Revolver's cover: Pretty damn trippy if you ask me, just lacking in color but why is that relevant?