A five-person a cappella group originally from Arlington, Texas, Pentatonix first found a national spotlight by winning the third season of NBC's The Sing-Off in 2011. With a decidedly contemporary spin on the format and unique strengths at each position in their lineup, they followed the appearance with a string of Top Ten albums, multiple Grammy Awards, and international chart success. In addition to their popular covers and original songs -- they charted with both Leonard Cohen's "Hallelujah" and their own "Can't Sleep Love" -- some of the quintet's biggest hits have come i...