Big Jeffy
From Muppet Wiki
Big Jeffy is a member of Little Jerry and the Monotones on Sesame Street. Big Jeffy was the bass singer.
He also appeared as a member of Little Chrissy and the Alphabeats in the songs "I Go to School" and "Gonna Rock You to Sleep"
Big Jeffy was named after Jeff Moss, who performed the character's voice. Jerry Nelson filled in for a sketch where the Monotones assist Grover in demonstrating the word "walk."
