The Beatles - i saw her standing there, 1963

"McCartney first worked out the chords and arrangement on an acoustic guitar at the family home of his Liverpool friend and fellow musician Rory Storm on the evening of 22 October 1962. Two days later, McCartney was writing lines for the song during a visit to London with his then-girlfriend Celia Mortimer, who was seventeen at the time herself. The song was completed about a month later at McCartney's Forthlin Road home in collaboration with Lennon and performed as part of their set in December 1962 in the Star-Club in Hamburg. It is also possible John Lennon had more to contribute than has been reported since there is more than one photo of both John & Paul working on the song with guitars in hand taken by Michael McCartney. John very likely contributed some chord ideas as well since he was already actively writing songs on his own by late 1962."