Gilbert and Sullivan (Sesame Street)

Gilbert and Sullivan are a pair of knowledgeable chaps who dispense information on various topics through elaborate, operatic numbers, often to the annoyance of Oscar the Grouch. The duo first appeared on Sesame Street in season 12 and appeared irregularly through season 21.

Their songs include:
 * "You Are What You Eat"
 * "The Letter B"
 * "At Your Library"
 * "Important"
 * "Listen"
 * "Before and After"

Which character was which was subject to discrepancy over the years. When they first appeared in 1980, the admiral puppet, who was performed here by Brian Muehl, introduced himself as "Gilbert," while his top-hatted partner, performed by Michael Earl, was "Sullivan." However, later, in at least two other songs, the singers switched names. Also, in these cases, Gilbert was performed by Richard Hunt, Sullivan by Martin P. Robinson.