The Amazing Marvin Suggs and his Muppaphone
From the Rita Moreno-hosted episode (9 Oct. 1976) of The Muppet Show. Voiced by Frank Oz with an Italian accent, this artiste "plays" "Lady of Spain" by hitting the tribble-shaped muppets (some named Lucy, Bernard, Marvin) with mallets as they go "ow" in key (noises of pain by Jim Henson & Jerry Nelson). Payback's a bitch, though, as a giant hammer slugs Suggs at the finale. You can find the song on The Muppet Show Album (1977) & CD Muppet Hits (1993).
The Muppahone gag is awfully similar to Arthur Ewing and His Musical Mice, from Monty Python's Flying Circus.
Marvin Suggs shows up again with a new act as Marvin Suggs and his All-Food Glee Club.