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 for a variety of musical entertainment programs aboard Princess Cruises, including The Voice (of the Ocean), Festivals of the World: Mardi Gras, and Magical Mystery Tour. Zack has additionally written arrangements for several cabaret entertainers across different cruise lines. On land, he currently plays drums with The Reference, an Alt Rock power trio of which he is a cofounder, while balancing a very active schedule as a private instructor and clinician. During football season, Zack is a trombone player and arranger for the Denver Broncos' Stampede 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. In other past studio experience, Zack was the composer for Unvented, a short-form sci-fi/comedy web series, the creator and host of a well-reviewed podcast called "The Soundtrack" where he discussed 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 Sheet Music Plus, J.W.Pepper, and UNC Jazz Press. He is currently concentrating his efforts toward library music and other multimedia projects.

Zack has performed with several high profile artists such as rapper Flo Rida, and has made frequent appearances as a sideman at the critically acclaimed DazzleJazz, 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.

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.