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SEASON PREMIERE: Season 43 of Sesame Street begins with the introduction of a new recurring segment: Elmo the Musical, the replacement for Elmo’s World that has Elmo imagining how to make math seem musical. And Elmo’s not the only one displaying an imagination: Other sketches on Sesame Street this season include – ready? – Birdwalk Empire and Upside Downton Abbey. Gotta love it.