Pentatonix also put out a deluxe edition of that album in October, which includes the rendition of “Joy to the World” heard at the tree-lighting ceremony. Pentatonix Scores First No. 1 Album ...

Welcome to E!'s Backstage Pass. The best way to spread holiday cheer may just be singing Pentatonix loud for all to hear. "It's one of our biggest shows we've ever done," Scott teased to E!

3 Video: Go Inside the Starry NYC Premiere of THEATER CAMP 4 Video: The Teen Critics Take a Trip to Theater Camp Pentatonix brought ... of the holiday classic "Joy to the World." ...

RELATED: 'A Pentatonix Christmas Special' preview: See group perform 'Joy To The World' So settle in with a cup of warm cider for Pentatonix-palooza! We know it'll keep you in tune for the whole day.

the Pentatonix. And what do you know ... To make this one extra special, they decided to go around the world. That means showcasing music and artists from other countries like pianist Lang ...

Your favorite a cappella group Pentatonix appeared on ABC's It's ... If you love this, you have to check out their rendition of "Joy to the World." ...

Pentatonix bundle up in their winter coats ... and Kevin Olusola — performed “Joy To The World” at the event. This is PTX’s third time at the annual ceremony. Later on, Andy Grammer ...