PTX, Vol. III (Volume 3) is the fourth extended play album by the a cappella group Pentatonix. It was released on September 23, 2014 by RCA Records, although it was released earlier in Australia on September 19, 2014. The extended play contains four covers as well as three original tracks ("On My Way Home", "See Through" and "Standing By"). As of October 23, 2015, PTX, Vol. III has sold 201,226 copies