Step 1 : Introduction to the question "Which Muppet sang the top-40 hit "Rubber Duckie"?"
..."Rubber Duckie" is a song sung by the Muppet character Ernie (voiced by Jim Henson) on Sesame Street. The song is named after Ernie's toy, a rubber duck affectionately named Rubber Duckie. The song, written by Jeff Moss and arranged by Joe Raposo, was released as a single and became a surprise mainstream hit, peaking at #16 on the Billboard Hot 100 on September 26, 1970. It was nominated for the Best Recording for Children Grammy in 1971 but lost out to the album The Sesame Street Book & Record, which contained the song.