Sgt. Pepper was really influenced by "Pet Sounds"--if you are so inclined, listening to PS, followed by SP is quite an eye opener--

A curious thing about Sgt. Pepper, given it's popularity, and the importance that it is generally acknowledged to have-- the songs from it are not played very much--and they never were played very much--there is the Joe Cocker version of "With a Little Help From My Friends", but that really took the song out of the Sgt Pepper setting, and of course, we all play "When I'm 64' for birthdays and such--