Their roadie wears a tie!
They are playing a song called Laundry Room.
Lovely interplay between the banjo and the acoustic guitar
the cello sound is just like a pedal steel guitar, played in a higher register than normal.
This is one of the best songs in their repertoire, with a subtlety of melody and emotion. Even tough the audience seem to prefer the on/beat stompers, I like this one best.