You can play along with The Beatles!
"I Should Have Known Better" is a song by English rock band the Beatles composed by John Lennon (credited to Lennon–McCartney), and originally issued on A Hard Day's Night, their soundtrack for the film of the same name released on 10 July 1964. "I Should Have Known Better" was also issued as the B-side of the US single "A Hard Day's Night" released on 13 July. An orchestrated version of the song conducted by George Martin appears on the North American version of the album, A Hard Day's Night Original Motion Picture Soundtrack. Lennon's harmonica playing opens the track, the last occasion the Beatles were to feature this instrument on an intro ("I'm a Loser", recorded 14 August 1964 has a harmonica solo) and thus draws a line under a significant period of their early music.
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A video for this song: