Home Free, a vocal band from US, sings, perhaps, one of the best renditions of a Christmas Song Angels We Have Heard On High a capella. In their Christmas album Full of Cheers, their rendition of Silent Night and O Holy Night are music to my ears. Home Free won the The Sing-Off (on NBC) in 2013.
Silent NightTaylor Davis, a violinist, features Home Free in this Silent Night video. Austin Brown's powerful voice is magnetic.
O Holy Night
In this performance, you'd hear contrasting versions of O Holy Night — bass by Tim Foust and tenor by Austin Brown. When you listen to Home Free a capella, you would hardly notice that there are no musical instruments that accompany their singing.