There was a short musical skit on Sesame Street in the 1970s which featured a muppet who looked like the singer Joe Cocker (lots of facial hair) and had two "backup" girl singers. The song had no words, just sounds. It went something like "Unum a num bop baby beepee..." The character would start the song and the two backup singers would follow. Then the character would get a carried away with his singing and the two backup singers would look at him like he was crazy. Then he got back on track with his singing. Does anyone know the name of this character and the song and what episode of Sesame Street it was on? Every now and then they repeat it this skit. Thanks a lot.