Guess the 1960s song lyrics #278

*First line is the duo name. 1964. British duo. Song written by Paul McCartney when he was 16. It was an international hit. McCartney moved into the home of his girlfriend and shared a room with her brother, who became half of this duo. It is one of two songs credited as written by Lennon-McCartney that reached number 1 in the US and performed by an artist other than the Beatles.