Jim Henson's Muppets, known for their presence on the educational television series "Sesame Street," as well as "The Muppet Show" and numerous other films and appearances, earned their creator a place in television and puppetry history, and gained worldwide recognition for each of their own quirky characters. This recognition has fostered spin-off merchandise based on the Muppets alone as well as the various programs in which they appeared. Hal Leonard Publishing produced sheet music for the popular theme to "Fraggle Rock," a Henson-produced series.