Pentatonix (often named as PTX) is an American a cappella group from Arlington, Texas, consisting of five vocalists: Avi Kaplan, Scott Hoying, Kirstin 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 their original material. Their music has their own variety of different types of mouth vocals like: tight vocal harmonies, extensive vocal riffing, deep and steady vocal basslines, and a wide range of vocal percussion and beatboxing.