Muse left Disney following the 1941 strike there and joined Metro-Goldwyn-Mayer's animation department in 1941, along with fellow animators Ray Patterson, Preston Blair, Ed Love, Walter Clinton, and Grant Simmons. He was assigned to the Hanna - Barbera unit, where he remained for 17 years. He first provided animation for the eighth Tom and Jerry short, "Fine Feathered Friend" (1942), as well as the last Hanna-Barbera "Tom and Jerry", "Tot Watchers" (1958), and nearly 120 other shorts in between. Muse also animated Jerry Mouse dancing with a live-action Gene Kelly in the 1945 musical "Anchors Aweigh" (and became archive footage as Jerry's visible in "Family Guy" episode, "Road to Rupert").