It takes more than gravity to keep Mucca Pazza sitting in chairs; it takes music stands and artistic discipline to keep the members of this mobile orchestra from bounding out of their seats and into the audience. Dressed for a formal affair in pastels and dinner jackets, this composers’ collective draws inspiration from Ellington, Esquivel, and Zappa, for a headier, swankier set than their usual off-the-chain rockers. The careful listener may recognize a movement by Stravinsky or a theme by Morricone, or the somehow-familiar soundtrack to a nonexistent film. Still staying true to their mobile roots, Mucca Pazza embodies the music, making their intricate compositions and lush cinematic arrangements visually accessible to all audiences. Cheerleaders, now Masters of Ceremony, play host to a set that will surely incite future and former band geeks to rescue instruments from dust bunnies, lockers and local pawn shops.