I'm not sure if most people know that Sgt. Peppers Lonely Hearts Club Band started out as a concept album. Each of the Beatles got their own new persona and at the end of the first song, "Sgt. Peppers Lonely Hearts Club Band," the band introduces Billy Shear who is actually Ringo and he sings, "With a Little Help From My Friends." After those two songs the idea of a concept album goes out the window.
I did know that the Beatles credited the Beach Boys saying that if Pet Sounds did not exist, Sgt. Pepper's would have never existed. It's a shame that Brian Wilson went a little insane after the making of Pet Sounds it would have been interesting to see what he would have come back with as a response to Sgt. Peppers.