The Beatles song 'SHE Loves You' was released in 1963 and became one of the most successful singles of all time. It was written by John Lennon and Paul McCartney and is considered to be one of the most iconic songs of the British Invasion. The three letter solution for the crossword is 'SHE', which is the subject of the song. The song is about a young man who is trying to win the affections of a girl, and he sings that 'SHE loves you, yeah, yeah, yeah'.