Philip Glass for Sesame Street.

I don't think they still do innovative things like this with children's programming anymore.

The closest thing I can think of is 'Biz's Beat of the Day' on Yo Gabba Gabba. (Not that I am overly versed in children's programming.)

Philip Glass did a series of animations for Sesame Street in the 70s. This is one of them.

Read about it here. (Whoa, the muppets have their own wiki!)