Popsugar Entertainment Pentatonix Backstreet Boys and Pentatonix "Winter Wonderland" Video We Must Have Been Good This Year, Because PTX and BSB Blessed Us With a Christmas Duet 11 December 2018 by Kelsie Gibson View On One Page Photo 1 of 7 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 1 PTX and BSB - Winter Wonderland (Snippet) Previous Next Start Slideshow PentatonixBackstreet BoysMusicTV