“A Hard Day’s Night” is a song by the English rock band The Beatles. Written by John Lennon, and credited to Lennon-McCartney, it was released on the movie soundtrack of the same name in 1964. It was later released as a single, with “Things We Said Today” as its B-side.
The song featured prominently on the soundtrack to the Beatles’ first feature film, A Hard Day’s Night, and was on their album of the same name. The song topped the charts in both the United Kingdom and United States when it was released as a single. Featuring a prominent and unique opening chord, the song’s success demonstrated that the Beatles were not a one-hit wonder in the US.