Mr. O was a 15-minute broadcast aimed at five to eight year olds. Every day Mr. O would appear on the program with charming puppets designed by John and Linda Keogh, in such personifications as Clarence the Clarinet and Chelly the Cello. He would engage in dialogue with the puppets and a whole visual sequence was developed which was intrinsically pleasant to look at, while at the same time the musical values were indirectly communicated to children.