Pentatonix (or PTX) is an American a cappella group consisting of five vocalists originating from Arlington, Texas. The members in this group are Avi Kaplan, Scott Hoying, Kirstie Maldonado, Kevin Olusola, and Mitch Grassi. Their work, which is mostly in the pop style, consists of covers of existing songs, sometimes in the form of medleys, along with original material.