The group won the third season of The Sing-Off in 2011, and subsequently received a recording contract with Sony.

It was re-released in November 2013 with one of its new tracks, "Little Drummer Boy", debuting at number 13 on the US Billboard Hot 100 and charting in other countries such as Austria, Canada and New Zealand.

[5] In May 2014, Pentatonix signed with RCA Records, a "flagship" label of Sony,[6] releasing their debut studio album, PTX, Vols.

It contained all of the songs from their two namesake EPs and four additional tracks, previously released as singles.

[9] As of July 2017, Pentatonix has sold 4.9 million albums in total in the United States.