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Pentatonix is an a capella music group, consisting of Scott Hoying, Kirstie Maldonado, Mitch Grassi, Avi Kaplan and Kevin Olusola. The group rose to fame following their victory in the third season of NBC's The Sing-Off.
In January 2014, coinciding with their appearance on the show, the group also released a special video from the Sesame Street studios on their YouTube channel featuring a mash-up of "C is for Cookie" and "Rubber Duckie" and featuring a cameo appearance by Cookie Monster himself.