0A Cappella-wesome!In their latest release, five-piece a cappella group and 'The Sing-Off' superstars Pentatonix bust out their grandma's coats and pop some tags with a cover of Ryan Lewis and Macklemore's 'Thrift Shop.' Updated Apr. 21, 2017 1:37PM EDT / Published Jan. 17, 2013 12:59PM EST