Listen to Yo-Yo Ma's Rendition of The Simpsons Theme

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."