<P> The song is in the key of E major and is in time during the verse, chorus and bridge, but changes to in the pick - up to the verse . It grew (like "Sun King") from the F ♯ m--E changes from Fleetwood Mac's "Albatross" ("like she does" (F ♯ m7) "yes she does" (A, Am) "yes she does" (E)) with McCartney arranging instrumental and vocal parts and Harrison adding a descending two - part lead guitar accompaniment to the verse and a countermelody in the bridge . Alan W. Pollack states that "the counterpoint melody played in octaves during the Alternate Verse by the bass and lead guitars is one of the more novel, unusual instrumental touches you'll find anywhere in the Beatles catalogue ." </P> <P> Multiple versions of "Don't Let Me Down" were recorded by the Beatles during the tumultuous Get Back (Let It Be) recording sessions . The version recorded on 28 January 1969 was released as a B - side to the single "Get Back", recorded the same day . "Get Back" reached number one and "Don't Let Me Down" reached number 35 on the US Billboard Hot 100 . When the "Get Back" project was revisited, Phil Spector dropped "Don't Let Me Down" from the Let It Be (1970) album . </P> <P> The Beatles performed "Don't Let Me Down" twice during their rooftop concert of 30 January 1969, and the first performance was included in the Let It Be (1970) film, directed by Michael Lindsay - Hogg . In November 2003, a composite edit of the two rooftop versions was released on Let It Be...Naked . </P> <P> The B - side version of the song was included on the Beatles' compilations Hey Jude, 1967 - 1970 and Past Masters Volume 2 and Mono Masters . The same recording also appears on the soundtrack to the 1988 documentary, Imagine: John Lennon . </P>

Who sang lead on don't let me down