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Lennon is said to have selected it as one of his favourite songs by The Beatles. In 1987, Lennon's original handwritten lyrics of the song, containing 14 lines and some "doodles" in the margin, sold at auction for US $19,500. The song is playable in The Beatles: Rock Band.
The song is one of 17 songs recorded by The Beatles that mentions the words "sun" or "sunshine" and according to Julian Lennon, it is one of his favourite songs written by his father.
The descending chromatic bass-line in the song is similar to that of "Lucy in the Sky with Diamonds".
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