The Beatles - good day sunshine, 1966

"Paul McCartney wrote "Good Day Sunshine" at Kenwood, John Lennon's house in Surrey. Drawing inspiration from the sunny day, McCartney composed the melody on Lennon's piano.[7] He later said that Lennon helped write the song, but "it was basically mine." Lennon recalled that the song was McCartney's and that he perhaps "threw in a line or something".