Pentatonix fans, do we have something special for you.
Fellow "Sing-Off" stars Home Free, who won Season 4 of NBC's competition series in 2013, are back with a new music video for their cover of the Oak Ridge Boys' song "Elvira," and (surprise) the legendary gospel and country group join in on the fun.
The group's third album, "Country Evolution," is slated for a Sept. 18 release on Columbia Records.
Check out Home Free's music video with the Oak Ridge Boys below, exclusively debuting on The Huffington Post:
Want more Home Free? Check out their incredible a cappella version of Johnny Cash's "Ring of Fire."
Also on HuffPost:
For a constant stream of entertainment news and discussion, follow HuffPost Entertainment on Viber.
HuffPost Entertainment is your one-stop shop for celebrity news, hilarious late-night bits, industry and awards coverage and more — sent right to your inbox six days a week. Learn more