Home Free, the country acapella group on 'The Sing-Off' put their unique spin on the country classic 'Ring of Fire.' Their performance had the judges on their feet after one of the lowest notes I've ever heard.

To no surprise, Home Free sailed into the next round on 'The Sing-Off' on NBC. I can't wait to hear what they're going to do next.

NEXT: Home Free 'Cruise'

Home Free Performs Acapella 'Cruise' on The Sing-Off

MORE: Home Free 'Life is a Highway'

Home Free Sings 'Life is a Highway' Acapella on The Sing Off

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