A cappella ensemble Pentatonix's fourth studio EP, 2014's PTX, Vol. 3 features more of the group's forward-thinking, genre-bending vocal music. This is the group's third mini-album since winning NBC's The Sing-Off in 2011. As with 2013's PTX, Vol. 2, here we get a mix of modern pop covers and original songs, all done in the group's trademark combination of EDM, R&B, and traditional vocal group styles. Included are the songs "Problem" and "La La Latch."