"Dixieland" jazz may have began in the whore houses of New Orleans, which is why they called it "Dixieland"; but modern jazz bagan in New York with Bird and Diz, two names that are foreign to the Dixieland proponents of jazz. They began with "Be Bop', and I have never seen anyone dance to Be Bop. Not only did Dixieland predate modern jazz, but it was also geographically and culturally different.
"Pops", as Lewis Armstrong was affectionately referred to by the new musicians, often went to see them perform.