Pentatonix

  Pentatonix is a group of  EUA a capella composed of five vocalists: Scott Hoying, Kirstin "Kirstie" Maldonado, Mitchell "Mitch" Grassi, Avriel "Avi" Kaplan e Kevin "KO" Olusola ,formed in the city of Arlington ,Texas.The group won the third season of the show  THE SING-OFF  the US television network

NBC in  2011 a capella singing an arrangement of the song  EVE OF THE TIGER.
   Originally recorded by rock band survivor as their victory song.

  The group is currently preparing for his world tour in 2014.4 On June 25, 2014 Entertainment Weekly reported that the group will join the cast of Pitch Perfect 2, planned for 2015.5