John says his first song was Hello Little Girl which he wrote on the toilet (!) at 18 so that would be 1958.
Paul says he wrote I Lost My Little Girl just after his mother died, so that would be November or December 1956. Definitely the first song written by a Beatle.
The first song that Beatles perfomed live is guiatar boogie.
The first Lennon/McCartney song could be You’ll Be Mine. But they started collaborating at the end of 1957
