In 1969, he became the first head writer, along with a composer and lyricist, for Sesame Street. He would eventually win fourteen Emmy Awards for the show. Songs he wrote for the show include "I Love Trash", "Who Are the People in Your Neighborhood", and "Rubber Duckie". "Rubber Duckie" became a surprise mainstream hit, reaching #16 on the Billboard Hot 100 in September 1970. Moss is also credited with, among other things, creating the character of Cookie Monster, based on a puppet Jim Henson had created called "Boggle Eyes".
Moss wrote the song "Nasty Dan", which Johnny Cash sang when he appeared on Sesame Street; it later appeared on the 1975 The Johnny Cash Children's Album. In 1976, the song became a #1 hit in France for Claude François, who recorded it with French lyrics under the title "Sale Bonhomme". In 1984, Moss wrote the music and lyrics for The Muppets Take Manhattan.
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