Carol Burnett guest stars on this week's episode of Glee.

And if the mere appearance of this comedic legend as Sue's mother isn't enough to get you excited, there's this nugget: she'll team up with Jane Lynch for "Ohio," a single from the 1953 musical "Wonderful Town."

Watch the official promo for Tuesday's installment HERE and then enjoy the following sneak listen at this Lynch/Burnett duet:

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.