Leo Sayer (b. 1948) is a British pop singer who guest starred on The Muppet Show episode 302.
He scored two #1 hits on the Billboard singles chart in 1977, "You Make Me Feel Like Dancing" and "When I Need You", both of which he performed on The Muppet Show (along with "The Show Must Go On", which he co-wrote).
Sayer also appeared on The Tonight Show when Kermit the Frog hosted, and sang a duet of "When I Need You" with Miss Piggy.