The Mamas and Papas-In-Law
From the "How Not to Manage a Rock Group" episode (first aired 28 Apr. 1968) of forgotten television sitcom The Mothers-In-Law.
At the grand conclusion of this episode, the two sets of parents (after failing in managing the rock group) join with The Friends Indeed to tramp around in Salvation Army style uniforms to "Some Enchanted Evening" set to a stirring martial beat.
See also The Warts