Zack Demos, who began his own music production company under the name Mute City Music in 2015, is a composer/arranger, multi-instrumentalist, and producer based in Denver, CO. Since its inception, Mute City Music has produced arrangements in various musical entertainment programs for Princess Cruises, including The Voice (of the Ocean), Festivals of the World, and Magical Mystery Tour. Zack has additionally written almost 200 musical arrangements for a variety of cabaret entertainers across several cruise lines. On land, he currently plays drums with his own power trio known as The Reference, an Alt Rock band of which he is a co-founder along with his friends, Kevin Ruby and Jonathan Zimny, while balancing a very active schedule as a private instructor and clinician. During football season, Zack is a trombone player and arranger for the Stampede Denver Broncos brass band.

Specializing in the genres of Jazz, Rock, and Pop music, Zack’s compositions and arrangements have been performed live all over the state of Colorado as well as on Denver’s esteemed public radio station, jazz89.3 KUVO. He is featured both as a composer and trombonist on Hang Time (Tapestry/Capri Records), the 2nd CD released by the Colorado Conservatory for the Jazz Arts alumni, directed by renowned Jazz artists Paul Romaine, Greg Gisbert, and Eric Gunnison. As for his own studio projects, Zack is the composer for Unvented, a short-form sci-fi/comedy web series, and is the creator and host of a well-reviewed podcast called The Soundtrack where he discusses music in film, television, and video games. Winner of the 2012 UNC Jazz composition contest, Zack composes Big Band music for all levels, and those charts are available through J.W.Pepper, UNC Jazz Press, and Sheet Music Plus. He is currently concentrating his efforts toward Jazz music for moderately experienced bands. 

Zack graduated from the University of Northern Colorado in 2014 where he studied Jazz composition/arranging with Erik Applegate and Kerry Marsh and obtained a degree in Music Business. During school, Zack worked part-time as a lab monitor for UNC’s school of music assisting students in the use of various music software programs. 

Zack's notable performances include critically acclaimed DazzleJazz, the Highlands Ranch Mansion, Hotel Boulderado, and Brown Palace. Zack has also had the pleasure of performing in the pit orchestras for Joseph and the Amazing Technicolor Dreamcoat (drums) and Urinetown (trombone) both with Stage Flight Theatre. He was also recognized as an outstanding soloist (trombone) at the Metro State University Jazz Festival in 2010. With his high school, Mountain Vista, he had the honor of performing at Carnegie Hall in New York and in the Saint Patrick’s Day Parade in Dublin, Ireland.