One of the most notable of Musser's contributions to the world of percussion is his work as a conductor and promoter of large marimba orchestras. One of the first of such groups was a 25-piece, all-girl marimba ensemble for a Paramount Pictures event in Chicago. In 1933 at the Century of Progress International Exhibition in Chicago, Musser conducted a marimba orchestra of 100 players. A special marimba, the "Century of Progress Model" was designed by Musser and produced by the Deagan company. Most of Musser's future marimba orchestras would follow a similar model. That is, Musser would select players, arrange and write the music, rehearse and conduct the orchestra, and design a special instrument for the group. The largest group Musser had ever assembled was an orchestra of 300 marimbas appearing at the Chicago Railroad Fair in 1950.