UIL State Marching Band Contest Combo: 3A Prelims/3A Finals takes over the Alamodome in San Antonio for a day of high-energy marching band performances from Texas high school bands. Expect big drumlines, precise formations and the kind of school spirit that fills a massive stadium. It's a fun way to see some of the state's top young musicians go head to head. Bring your school colors, cheer loudly for your favorites and soak up the energy of one of Texas's biggest marching band showcases.