Since its inception in 1969, the public television show has redefined what it means to teach children through TV, with music as its resounding voice. Before “Sesame Street,” it wasn’t even clear that you could do that; once the series began, as a radical experiment that joined educational research and social idealism with the lunacy of puppets and the buoyancy of advertising jingles, it proved that kids are very receptive to a grammar lesson wrapped in a song. – The New York Times