Gladys Knight (b. 1944) is a Motown rhythm and blues singer, best known as the leader of Gladys Knight and the Pips, who guest starred in episode 516 of The Muppet Show.
She also sang the Sesame Street theme on the 1988 pledge-drive special Sesame Street, Special, backed up by the Pips. They appeared on the second celebrity version of "Put Down the Duckie", replacing the New York Mets.
Knight along with the Sesame Street cast in 1988