PTX, Vol. 1 is the debut extended play album by the a cappella group Pentatonix. It was released on June 26, 2012. 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 with 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, which went viral. Commercial performance The album peaked at number 14 in the US Billboard 200 chart and number 5 on the digital chart selling 20,000 copies in its first week of release. It also peaked at number 2 on the US Billboard Top Independent Albums chart making it Madison Gate Records' highest charting release to date. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.