American pop crooner Andy Williams (1927-2012) guest starred on The Muppet Show episode 422.
His hits include "Can't Get Used to Losing You," "Love Story," "Music to Watch Girls By" and "Happy Heart." He is also famous for his rendition of "Moon River".
He is one of a small group of Muppet Show guests to have had a Muppet made in his likeness (or in this case, a trio, all voiced via multi-track by Williams).