I looked 'em up Coz... they seem to have a pretty decent schedule. Love the hats!
Here's their Chicago Style Bluegrass take on "Minor Swing"-
https://www.youtube.com/watch?v=lEqMhASKr-I
OK, I was at another computer & checked your link.
The hats are now black, and they've changed bassists at least once (they go through bassists like Spinal Tap does drummers - though no spontaneous cumbustion that I'm aware of); current one is considerably shorter & much more female than that one.
He was a grad student from Czechoslovakia; I mentioned his bass in another thread. Turn it around & you'll see the most dramatic tiger-stripe I've ever seen.
As a point of interest, I learned the other night (the guitarist busted a wire & was
really slow changing it) that the first bassist was also distaff; bought her bass from a jazz cat who played it at Harry Truman's nomination party, so she called it "Truman" - the name evolved from that.