Who encouraged Lennon and McCartney to write a song ?
Lennon – McCartney ( also written Lennon / McCartney and occasionally known as McCartney – Lennon ) is a rock music songwriting partnership between English vocalists John Lennon ( October 9 , 1940December 8 , 1980 ) and Paul McCartney ( born June 18 , 1942 ) of The Beatles .