A look back at 40 years of Seasame Street.
Matt Robinson
Emilio Delgado
Bob McGrath
Lena Horne
Linda Bove
Will Lee
Alaina Reed Hall
Fred Rogers
Diana Ross
Madeline Kahn
James Taylor
Roscoe Orman
Loretta Long
Sonia Manzano
Smokey Robinson
Patti LaBelle
Johnny Rzeznik
Robert De Niro
Bill Irwin
Michael Jeter
Beyoncé
Michelle Williams
Kelly Rowland
Alan Muraoka
Olamide Faison
Alicia Keys
Matt Lauer
Alison Bartlett
Chris Knowings
David Beckham
Neil Patrick Harris