The recording of the song began at
EMI Studios on 27 April 1966 with eleven takes of the rhythm track, comprising two acoustic guitars, bass and drums. Five further takes of the song were recorded but they were not used. Take 11 was chosen as the master and two days later Lennon added his lead vocals. On 5 May,
George Harrison wrote and recorded the double guitar part. The next day the recording was completed by Lennon, McCartney and Harrison's backing vocals. The song features the then-unique sound of a reversed guitar duet played by Harrison in a five-hour late-night recording session with producer
George Martin. Harrison perfected the part with the tape running backwards so that, when reversed, it would fit the dreamlike mood. One guitar was recorded with fuzz effects, the other without. Engineer
Geoff Emerick described the meticulous process as "interminable". "I can still picture George hunched over his guitar for hours on end", Emerick wrote in 2006, "headphones clamped on, brows furrowed in concentration." During the break before the second bridge, the sound of a yawn can be heard, preceded by Lennon saying to McCartney, "Yawn, Paul." ==Release==