"For No One" (1966)
George Martin took a very collaborative approach when working out arrangements with his young charges. There are many instances of Martin transcribing musical notation on the spot, wrestled from the Beatles' impromptu whistles and hums. But perhaps the most memorable occurred during the recording of this Revolver track. When singing the solo that he wanted from a French horn, McCartney unknowingly hummed a note that was off the scale of the instrument and technically impossible to play. Martin informed him of this, yet the Beatle was undeterred. "George saw the joke and joined the conspiracy," McCartney said later. But session man Alan Civil was such a pro that he proved able to hit the high note, giving the song its emotional climax.