This American classic told the story of a non-traditional family unit -- a woman with three daughters who marries a man with three sons, and the way they come together in laughter and love, learning life's lessons along the way. The opening theme was composed by creator Sherwood Schwartz and Frank De Voll and performed by Peppermint Trolley Company, creating the illusion that the Brady children are singing the story of their family. Like Schwartz's other show on this list, 'Gilligan's Island,' 'The Brady Bunch used the opening theme for exposition so Schwartz wouldn't have to waste an episode explaining how the family came to be.