When the Beatles got bored of their clean-cut image, they tried something controversial, leading to the creation of a rare artwork that was quickly hidden.

Worrying that perhaps his bandmate was leaving him behind, this Beatles hit made John Lennon feel insecure about his own ability or stability in the group.

Ian detailed the impact of the Beatles' classic: "Yesterday' feels like a shift in the balance of power. From the beginning they were equals, and 'Yesterday' wasn't only just a hit, but the song that ...