Lucy in the Sky with Diamonds" is a song written by John Lennon in 1967, and recorded by The Beatles for their album, Sgt. Pepper's Lonely Hearts Club Band. The song has a complex arrangement typical of later Lennon-McCartney compositions; much of the song is in triple metre or 3/4 time, except in the chorus, where it switches to 4/4 time. It is said to have been the first rock song written in two different metres or beats. The song also shifts between musical keys, using the key of A for the verse, B-flat for the pre-chorus or bridge section, and G for the chorus. It consists of a very simple melody (reminiscent of a nursery song), sung by Lennon over an increasingly-complicated underlying arrangement which features a sitar, played by George Harrison, and a Hammond Organ, whose sound was altered by Lennon and producer George Martin. The lyrics of the song — which is commonly believed to be about an acid trip — feature image-laden verses which present an overtly psychedelic travelogue, describing a boat trip through a fantastic land of "cellophane flowers", "newspaper taxis" and "marshmallow pies", alternating with chorus sections which simply repeat the song's title. The Beatles, however, have steadily maintained that the initials of the title forming the word "LSD" (Lucy in the Sky with Diamonds) is mere coincidence, as the title is taken from a drawing by a young Julian Lennon.