What is the birthday of the composer of the song "Cups" that wasn't Luisa Gerstein?
Cups (song):  Composition of the song is credited to A. P. Carter and Luisa Gerstein of Lulu and the Lampshades. A. P. Carter: Alvin Pleasant Delaney Carter (December 15, 1891 – November 7, 1960) professionally recording as A.P. Carter, was an American musician and founding member of The Carter Family, one of the most notable acts in the history of country music.
December 15, 1891