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The Simpsons got classical on Sunday's episode.
Not only did Yo-Yo Ma make a cameo as himself in the episode -- to help Mr. Burns serenade Mrs. Bouvier -- but the renowned cellist performed the show's theme song, which played over the closing credits. Take a listen:
Asked on Twitter how the show nabbed Ma, executive producer Al Jean said, "We asked and he said yes; lucky us." @DavidNgLAT @TheSimpsons We asked and he said yes; lucky us