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Structurally, the music begins with a piano ballad and moves to several other styles, including boogie-woogie piano, arpeggiated guitars and nursery rhyme. Beatles author Ian MacDonald speculates that the guitar arpeggios at the end of the track were influenced by "I Want You (She's So Heavy)" and the middle section of "Here Comes the Sun", and that the overall structure was inspired by Lennon's "Happiness Is a Warm Gun" from the previous year's album "The Beatles", which also joined unrelated song fragments together.