Elmo's World/L M N O (by They Might Be Giants)

Cast

 * Mr. Tiger, Cactus, Geppetto, Groucho Marx Muppet and Old MacDonald as They Might Be Giants

Lyrics
Mr. Tiger: Hello children, it's time for an important lesson with Professor Flans. This is about four letters that people sometimes confuse for one: LMNO!

Cactus: LMNO Are four letters LMNO Are not one

Geppetto: L L M L M NM N Ohhhhhh! LMNO L M N Ohhhhhh! LMNO

Groucho Marx Muppet: LMNO Are four letters LMNO Are not one

LMNO

Old MacDonald: L M N Ohhhhhh! LMNO L M N Ohhhhhh! LMNO