2. The Beatles, 'Sgt. Pepper's Lonely Hearts Club Band' (1967)
Sgt. Pepper's showed off the more fantastical, surreal and avant-garde aspects of the Beatles, and it was heavily due to inspiration they gained from the Beach Boys' Pet Sounds. "Without Pet Sounds, Sgt. Pepper never would have happened," Martin wrote in the liner notes of a Beach Boys box set. Pepper was an attempt to equal Pet Sounds." Beyond the influence of another popular band of the time, Martin's heavy experimentation with signal processing transformed the atmosphere and entire sound of the album, creating technical masterpieces like "Lucy in the Sky With Diamonds" and the simple and gorgeous, "A Day in the Life."