LAS VEGAS, NV - MAY 17: (L-R) Singers Avi Kaplan, Scott Hoying, Mitch Grassi, and Kevin Olusola of Pentatonix attend the 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015 in Las Vegas, Nevada. (Photo by Steve Granitz/WireImage)
LAS VEGAS, NV - MAY 17: (L-R) Singers Avi Kaplan, Scott Hoying, Mitch Grassi, and Kevin Olusola of Pentatonix attend the 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015 in Las Vegas, Nevada. (Photo by Steve Granitz/WireImage)