"Eight Days a Week" is a song by the English rock band the Beatles. It was written by Paul McCartney and John Lennon based on McCartney's original idea. The song was released in the United Kingdom in December 1964 on the album "Beatles for Sale". In the United States, it was first issued as a single in February 1965 before appearing on the North American release "Beatles VI". The song was the band's seventh number 1 single on the "Billboard" Hot 100, a run of US chart success achieved in just over a year. The single was also number 1 in Canada, Belgium and the Netherlands.