The sporting houses needed professors, and we had so many different styles that . . . it wouldn't make any difference that you just came from . . . whatever your tunes were over there, we played them in New Orleans.
Source: In Hear Me Talkin' To Ya, by Nat Shapiro and Nat Hentoff.
-- Jelly Roll Morton, (Sep 20 c. 1885-1941), US jazz singer, composer, pianist, bandleader; He was the first great composer of orchestral jazz.