The Electric Company: The Office Sign Song

A familiar skit shown on The Electric Company was The Sign Sing-Along. It was often shown at the last sketch on a Friday episode and featured footage of signs with various words and were married to a sing-along-type song. They were always sung once through, after which the viewers were expected to supply the lyrics the second time around ("All right, now we'll be quiet, and you sing it!") while a wah-wah-muted trumpet and bassoon duo played the melody of the words.

Here is the Office Sign Song