III (Volume 3) is the fourth extended play album by the a cappella group Pentatonix.

The extended play contains four covers as well as three original tracks ("On My Way Home", "See Through" and "Standing By").

[1] In April and May 2014 during their European tour, Pentatonix began working on PTX Vol.

Since they weren't always in one place at a time, the album was recorded at various tour locations such as Singapore, New York City and Japan.

[2] The song "On My Way Home" was originally written by the British alternative rock band Coldplay for their seventh studio album, A Head Full of Dreams, was given to Pentatonix and left off the final track list.