There' really is magic in a jam, where they're doing it for themselves, from within, from the depths. The other people who commented about Eli and Eddie, spot on.
Having been there(not on this scale) I was particularly taken by the look the guy singing high tenor shot the lead singer. It doesn't happen often. When it does, its magic. This guy knew that's what he was experiencing.
High tenor is Rick, he plays for Special Consensus. His brother Eddie plays for Ricky Skaggs. As of a few weeks ago, Eli Johnson sings for Doyle Lawson and Quicksilver. Check out my video of Little Bessie too.