After winning the title of champion in the reality show The Sing-Off, Pentatonix was signed to a record label, enabling them to pursue their goal of a musical career. The group promoted their then-upcoming EP through YouTube videos of covers of pop songs such as "Somebody That I Used to Know" by Gotye featuring Kimbra, "Gangnam Style" by PSY, and "We Are Young" by Fun, went viral on YouTube. (wiki)