Los Trotamúsicos is a Spanish animated television series, based on the Town Musicians of Bremen by the Brothers Grimm, produced by Estudios Cruz Delgado for Televisión Española and first broadcast on October 1, 1989. It ended on March 25, 1990.

The series follows the story of four animal friends, a rooster, a donkey, a dog and a cat, who form a band playing respectively guitar, drums, trumpet and saxophone.

Originally released theatrically as a 86 minutes feature film titled Town Musicians of Bremen, it was heavily expanded into a television series due its success. The film was also released in English as Once Upon a Tune. It was also known in Germany as Die Abenteuer der Bremer Stadtmusikanten. The film won the Goya Award for Best Animated Film.