He relocated in 1922 to Newton County, where he met the guitar player Curley Weaver.
Mapp was noted in Newton County as a harmonica virtuoso with a unique style, who often performed for tips on the street.
[3][4] In 1929, billed as the Georgia Cotton Pickers, they recorded for the Atlanta-based QRS label.
The certificate also noted that he was a musician; it was unusual at the time for a coroner to acknowledge such employment.
[1][2] A compilation album, Georgia Blues 1928–33, released in 1994 by Document Records (DOCD-5110), provides the most complete discography of Mapp's work.