Everybody knows "Sesame Street's" "Mahna Mahna," right? But we all remember this one, with two pink feathered cows (!) and one crazy caveman guy who looked like Animal, the "Muppet Show" drummer, YELLING "Mahna Mahna."
Apparently this was the original "Mahna Mahna" in 1969, with a much calmer delivery and a weird little hippie guy and two braided girls. YouTube has them both dated 1969, but with the crazy caveman guy appearing on "The Ed Sullivan Show," not "Sesame."
The Muppet Wiki has more details. I love how seriously they explain it: "Regardless of who is performing the number, the structure of the song remains the same: a central character attempts to conform to the structure of the song but falls into improvisational scat passages whenever possible. Although the back-up singers make an attempt to bring order back to the number, their effort is ultimately futile."