As the definitive snapshot of ‘60s pop culture (taken on March 30, 1967 by Michael Cooper at Chelsea manor Photo Studios), artist Peter Blake’s Sgt. Pepper cover was unlike anything the world had ever seen. The result was a collage bursting with color, texture, intellectual diversity, comedy, tragedy and time compressed. Even today, shrunk down to jewel case dimensions, the iconic design captures the eye and the imagination. And it came with a free cardboard mustache.