<P> Lennon said of the song, "Paul wrote it in the Cavern days . We just stuck a few more words on it like' grandchildren on your knee' and' Vera, Chuck and Dave'...this was just one that was quite a hit with us ." In his 1980 interview for Playboy he said, "I would never even dream of writing a song like that ." </P> <P> A clarinet trio (two B ♭ clarinets and a bass clarinet) is featured prominently in the song . Scored by Martin, he said they were added at McCartney's request to "get around the lurking schmaltz factor" by using the clarinets "in a classical way ." In the song's final verse, the clarinet is played in harmony with McCartney's vocal . Supporting instruments include the piano, bass, drum set, tubular bells, and electric guitar . </P> <P> The song was recorded 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 . There were multiple overdub sessions, including the lead vocal by McCartney on 8 December and backing vocals by McCartney, Lennon, and George Harrison on 20 December . The clarinets were recorded on 21 December . </P> <P> The song is in the key of D ♭ major . Recorded in C major, the master take was sped up to raise the key by one semitone at the insistence of McCartney . Martin remembers that McCartney suggested this change to make his voice sound younger . McCartney says, "I wanted to appear younger, but that was just to make it more rooty - tooty; just lift the key because it was starting to sound turgid ." </P>

What are the words to when i'm 64