A Cappella Group Home Free Covers Oak Ridge Boys' 'Elvira'

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 a cappella quintet's debut album , "Crazy Life," hit No. 1 on the iTunes Country chart and No. 4 overall. It also peaked at No. 40 on the Billboard 200  and No. 8 on Billboard's Top Country Albums . 

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."

"Country Evolution" is available for pre-order at iTunes , or to receive an autographed copy, visit Home Free's online store . 

Also on HuffPost: 

For a constant stream of entertainment news and discussion, follow HuffPost Entertainment on Viber .