Pentatonix is an acapella group that won The Sing-Off (2009). They have released "PTX Vol. 1" and "PTX Vol. 2", along with "PTXmas" (Deluxe Edition). The group consists of the trio (Mitch Grassi, Scott Hoying and Kirstin Maldonado), the rhythm of the group comes from Avi Kaplan (Bass and overtone) and Kevin Olusola (Cello beat boxer extraordinaire).Pentatonix released their latest EP, "PTX, Vol. III" on September 23, 2014 (U.S.).Pentatonix has returned from a tour covering not only the United States, but Europe, Australia and Japan, as well. This gave them the confidence to record a track in French (not their native language).On October 22, 2014, they will release another album, "What Christmas Means to Me". With the former holiday release reaching the number one sales in the Holiday category, they intend to release anther holiday album. This is two albums released within 6 weeks of each other. Most of the recording was done on the road, during the tour, as well as writing and arranging the tracks and recording new videos.