Avriel Benjamin "Avi" Kaplan won what show as part of the group Pentatonix?
Pentatonix:  Characterized by their pop-style arrangements with vocal harmonies, basslines, riffing, percussion and beatboxing, they are widely known for their covers, mostly of modern pop works or Christmas songs, sometimes in the form of medleys, along with original material. Pentatonix:  When Sony's Epic Records dropped the group after "The Sing-Off", the group formed its YouTube channel, distributing its music through Madison Gate Records, a label owned by Sony Pictures.
i don't know