"You Know My Name (Look Up the Number)" is a song by the English rock band the Beatles originally released as the B-side of the single "Let It Be" on 6 March 1970. Although first issued with their final single (and the penultimate single in the United States), it was recorded in four separate sessions beginning with three in May and June 1967, with one final recording session conducted in April 1969. The song features a saxophone part played by Brian Jones of the Rolling Stones. Composition The song is a music hall comedy number. John Lennon came up with the lyric/title after seeing a phone book. He said: McCartney once told Beatles recording analyst Mark Lewisohn, "[People] are only just discovering things like 'You Know My Name (Look Up the Number)'—probably my favourite Beatles' track!" He went on to explain: The lounge section includes a reference to Denis O'Dell, associate producer on the A Hard Day's Night film, whom Lennon had also worked with on How I Won the War. Partway through the song, Lennon introduces McCartney as "Denis O'Bell". The reference prompted numerous telephone calls to O'Dell's home by fans who said things such as, "We know your name and now we've got your number." Musical structure The song is in the key of D. The "You know" involves F–D melody notes against a I (D chord). A point of interest is the raised A melody note against a D/F chord on "name", "three" and "name". A significant moment is the Tonicization of the dominant with the use of vii7/V chord (Gdim) as part of the progression to V7 (A7 chord on "You know my name") and I (D chord after "number") that closes the verse. The song is also notable for use of the 5th chord tone on the VII chord to produce extra dissonance. Recording All four Beatles participated in the first three recording sessions on 17 May, 7 and 8 June 1967. A saxophone part, played by Brian Jones of the Rolling Stones, was recorded on 8 June. The recording of the song was left unfinished and untouched until 30 April 1969 when, with the help of Mal Evans, Lennon and McCartney laid down all the vocal tracks and added additional sound effects. George Harrison and Ringo Starr did not participate in this last session. Nick Webb, second engineer on 30 April session, described it