any great art movement. the greatest practitioners of it pushed one another to be better. >> the mic on the piano is quite low. >> in the studio, the beatles' natural creativity was sort of brimming over, and george martin was a brilliant collaborator and champion of that. >> run back the tape, please, would you? >> you can slow down or speed up the tape. you can put in backwards stuff. you can put in electronic sounds that you couldn't possibly reproduce live. >> something happens on air, i couldn't tell you what because we have a special man who sits here and goes like this, and the guitar turns into a piano or something, you know. and then you may say, why don't you use a piano? because the piano sounds like a guitar. ♪ we're sergeant pepper's lonely hearts club band ♪ >> there were f.m. radio stations that did nothing but play "sergeant pepper's lonely hearts club band" over and over for the first three or four days that it came out because that's all anybody wanted to listen to. ♪ lucy in the sky with