As Pentatonix's Evergreen Christmas tour takes off, the group is giving E! News an exclusive backstage pass to all the fun. "We started out just doing it for fun as friends," Scott Hoying told E! News. "We were just choir nerds. It was weird that just one thing after another kept happening and ironically, I think because we just did it as friends, it came across so organic and amazing and I feel like still we're living this dream."