The world's first country a cappella group had a phenomenal start to their career, winning NBC's The Sing-Off in 2013. Since then they've released five studio albums, including Country Evolution, which hit the No.4 spot on the Top Country Albums chart and featured unique Home Free takes on Dolly's '9 to 5', and 'The Devil Went Down to Georgia'.

10-man acapella group Straight No Chaser, who found fame on Youtube after forming at Indiana University, continually dazzle audiences with their renditions of pop classic and modern chart hits with highlights "Let It Go", and Pharrell Williams' "Happy" catapulting the group to mainstream success. This fall, they're back on the road again, celebrating the holiday season on the Top Shelf tour!