I Lost My Little Girl
Paul McCartney's first ever musical composition was called I Lost My Little Girl. He was just 14 at the time in late 1956 or early 1957.
In his 1991 solo album, Unplugged (The Official Bootleg), McCartney performs a somewhat evolved version of the same song. The guitar he used to compose the song was a Framus Zenith Model 17 acoustic. He still has it.
John Lennon also recorded this song during the "Get Back" sessions in 1969, but it was not released.