Pentatonix Kick Off The Holiday Season Insanely Early With Their New Video

Tork Kelly joins the 'Winter Wonderland'/'Don't Worry, Be Happy' mashup.

In the lane, snow is glistening. Wait, no it's not -- it's not even winter yet, but that won't stop Pentatonix from getting into the holiday spirit in their new mashup video featuring MTV Artist To Watch Tori Kelly.

The six singers put an a cappella twist on a Christmas classic, "Winter Wonderland," by seamlessly weaving in elements of Bobby McFerrin's 1988 feel-good single, "Don't Worry, Be Happy." Fitting, since that's probably the best attitude to take when you start hearing carols a full three weeks before Thanksgiving even goes down.

Related: 17 Signs Christmas Is Here Already And It's Way Too Soon

"Winter Wonderland/Don't Worry, Be Happy" comes to us from Pentatonix's recently released holiday album, That's Christmas To Me, their second seasonal release after 2012's PTXmas EP

Want more Pentatonix? Here they are singing the tweets of Harry Styles, Katy Perry and more.