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"Eight Days a Week" is a song written by John Lennon and Paul McCartney, which was recorded by The Beatles and released on their December 1964 album Beatles for Sale. "Eight Days a Week" is the first song which the Beatles took into the studio unfinished to work on arrangement during the session, which would later become common. The song was mainly recorded in two recording sessions on 6 October devoted exclusively to this song, which lasted nearly seven hours with a fifteen-minute break in between.