Most of the songs they wrote together were in the early years but after 67 i reckon, they
genrally wrote on their own with a 'little' help from each other. John said in an interview that
he reckon that he stop truely writing with Paul around 63-64. You can see the real songs they
wrote as a collaboration like She Loves You, I want to hold your hand, From Me To You,
A Hard Days Night. but later on on it was mainly alone like paul with Yesterday, Blackbird,
Hey Jude, Let It Be, Long & Winding Road or John with Don't Let me Down, Julia, Across
the Universe, Revolution..
Lucy in the Sky with Diamonds was a true collaboration i think!