Pentatonix

About

Acapella quintet that won the third season of NBC's The Sing-Off in 2011 and took home three Grammy's from 2015 to 2017. Their YouTube channel has over 18 million subscribers.  

Trivia

They released their debut album, PTX, Vols. 1 & 2, in 2014. Their second headlining tour was Pentatonix World Tour 2016