Pentatonix Perform a N’SYNC Medley! (VIDEO) 12/11/2012 by mj 11 Comments Listen to Pentatonix cover N’SYNC, this boyband-tastic a cappella super medley! Whoo hoo. The Sing-0ff winners will be back on tour in 2013, so watch out for that. Pentatonix will appear on The Tonight Show with Jay Leno, Friday December 15.