"When I'm Sixty-Four" is a song by the English rock band The Beatles, written by Paul McCartney (credited to Lennon–McCartney) and released on their 1967 album Sgt. Pepper's Lonely Hearts Club Band. McCartney wrote the song when he was about 14, probably in April or May 1956, and it was one of the first songs he ever wrote. The song was recorded in a key different from the final recording; it was sped up at the request of McCartney to make his voice sound younger. It prominently features a trio of clarinets (two regular clarinets and one bass clarinet) throughout. Recording: The Beatles recorded two takes of the song on 6 December 1966, during one of the first sessions for the as-yet-unnamed album that became Sgt. Pepper's Lonely Hearts Club Band. Martin produced, supported by engineers Geoff Emerick and Phil McDonald. McCartney overdubbed his lead vocal onto take two without the other Beatles present on 8 December. On 20 December, McCartney, Lennon and George Harrison overdubbed backing vocals and Ringo Starr added the sound of bells. Martin made two reduction mixes (takes three and four) with the latter best. On 21 December, session musicians Robert Burns, Henry MacKenzie and Frank Reidy overdubbed two clarinets and a bass clarinet onto take four. Emerick later explained, "The clarinets on that track became a very personal sound for me; I recorded them so far forward that they became one of the main focal points." Martin recalled, "I remember recording it in the cavernous Number One studio at Abbey Road and thinking how the three clarinet players looked as lost as a referee and two linesmen alone in the middle of Wembley Stadium." On the same day, Martin remixed the song for mono three times, although this was only a demo version. He made four new mono mixes on 29 December. On 30 December, unsatisfied with all of these attempts, McCartney suggested speeding up the track to raise it by around a semitone from its original key of C major to D♭ major. Martin remembers that McCartney suggested this change to