Big Bird better warm up his vocal cords!
The mega-popular a capella group Pentatonix may have won Season 3 of "The Sing-Off," but one of their biggest dreams is about to come true as they drop by "Sesame Street" to teach kids how to count to five.
As the "Sesame Street" YouTube account says, "Nobody has ever counted to five as beautifully and harmoniously as Pentatonix has."
Check out the video above to see each member of the group sing about a specific number, and if that isn't enough watch the video below to hear them cover "Sesame Street" classics like "C is For Cookie" and "Rubber Ducky."
The Pentatonix episode of "Sesame Street" will air Feb. 7 on PBS.