The opener makes perfect sense, including what the are reperesnting in that peice if you watch care full adn the corps were moving up field the was anther group marching up feild as well playing amazing grace, while that is going on the rest of the corps is playing a Dixie, then they later turn and play with the amller group. As it says on the website "1. Storyville, 1917
The birth of jazz. From gospel to dixieland-brass bands to ragtime, the first production will feature a small brass ensemble, a wailing brass and some flashy front ensemble work. Storyville is one of the places where jazz came in from the street - in the New Orleans French Quarter believed to be where Louis Armstrong made his first professional appearance. " its supose to represnt what it was like in new oreleans, if you watchit again i bet it would make more sense.