"Get Back" is a song recorded by the Beatles and written by Paul McCartney (though credited to Lennon-McCartney), originally released as a single on 11 April 1969 and credited to "The Beatles with Billy Preston."The Beatles performed "Get Back" as part of the Beatles' rooftop performance, which took place on the roof of Apple Studios in Savile Row, London on 30 January 1969, an edited version of which was included in the Let It Be film. "Get Back" was performed in full three times. During the third, which marked the end of the rooftop performance, the Beatles were interrupted by the police who had received complaints from office workers nearby. After the police spoke to Mal Evans, he turned off Lennon and Harrison's amplifiers only for Harrison to switch them back on, insisting that they finish the song.
—Peter-Patrick76 (peter-patrick@mail.com)