MU330 (pronounced "em-you-three-thirty", or "muso" as in musically aware) is a ska punk band formed in 1988 in St. Louis, Missouri. The original members met in St. Louis University High School music class 330 (hence the name of the band).
The band is self-described as "psycho ska" and is known for its lively performances and a general ethic of fun and optimism. MU330's lineup has changed frequently, but the foundations of the band remained intact — Potthast, Diebold and Moll.
Singer Dan Potthast has released solo work and has also started a second band The Stitch Up with former Slow Gherkin frontman James Rickman. Drummer Ted Moll has a side project band called Bagheera.