PTX, Vols. 1 & 2 is the fourth release by Pentatonix, first released on July 30, 2014 in Japan. Considered their first official studio album, it is a compilation of all sixteen recordings from their two namesake EPs (PTX, Vol. I and PTX, Vol. II), as well as three tracks previously released as singles. The Japanese version contains an exclusive cover of "Let It Go" (which was later released in the US on their Christmas album, That's Christmas to Me), the only previously unreleased track of the album. PTX, Vols. 1 & 2 is the first Pentatonix album released under their new label, RCA Records.