1977 New Mickey Mouse Club (S1 Ep4) - Rehearsals for the "Mousekadance” 

The New Mouseketeers take us backstage as they rehearse for the production number, “Mousekadance.” Mr. Simply explains the phrase “a chip on your shoulder." Cartoon not included.
Do you know which Mouseketeer was Mr. Simply? He is only shown in silhouette. It's Todd.