Gregory Hines tries to mediate Kermit and Piggy's relationship woes in The Muppets Take Manhattan
Gregory Hines (1946-2003) was an accomplished tap dancer and actor of stage and screen.
He made a cameo appearance in The Muppets Take Manhattan as a roller skater who lends his skates to Miss Piggy and a mediator between she and Kermit the Frog.
He also appeared with his brother, Maurice, in episode 1313 of Sesame Street, as well as in segments where they demonstrate near and far (First: Episode 1347) and high kicks (First: Episode 1349). He later appeared in Episode 2949 as "Gregory the Great." The episode includes a scene of him performing a tap dance routine with his mentee Savion Glover (as Savion).
Hines' caricature on the Sardi's wall in The Muppets Take Manhattan