PENTATONIX SET TO CELEBRATE THE 2017 HOLIDAY SEASON WITH CHRISTMAS TOUR, DELUXE HOLIDAY ALBUM, 2ND NBC SPECIAL TOUR KICKS OFF DECEMBER 3RD; TICKETS AVAILABLE THIS FRIDAY, AUGUST 25th A PENTATONIX CHRISTMAS DELUXE OUT OCTOBER 20TH PRE-ORDER AVAILABLE NOW VIA AMAZON Three-time Grammy® Award-wi