Beatles quiz: Who wrote it, John or Paul?

Slate has a fun quiz today where you're asked to guess who wrote particular Beatles tunes: John Lennon or Paul McCartney.

Although, the pair are listed as co-writers on all their Fab Four hits, they wrote the majority of them separately, with occasional input from the other. Some tunes they really did write together "eyeball to eyeball."

In later interviews, both Lennon and McCartney detailed who wrote what, although they didn't always necessarily remember all the specifics. And sometimes they disagreed as to which partner had the most input, or the initial idea for a song. Collaborations are like that.