Classically trained Creole musicians contributed European sophistication while newly freed slaves contributed unique rhythms and freedom of expression. Surplus military instruments, left over from the "War of Northern Aggression", were inexpensive and readily available.
New Orleans' thriving red light districts furnished a ready market for musicians (and other less licit professions) and thus assisted in the incubation of jazz. Dixieland is a spontaneous, joyful music that celebrates life. It is quite frankly "Good Time Music"