Now Greg, when has music not being danceable ever stopped people from dancing?

Rockabilly is danceable. Or not.

But your point is well taken. A lot of bluegrass music is performed while people are sitting and listening, rather than dancing.

Also, people aren't too keen on discussing the high lonesome and/or harmony sangin' thing here, either. To me, that also is a hallmark of bluegrass.

But I'm not so sure I can state unequivocally that you can't dance to Foggy Mountain Boys!

Also, I find that today's bluegrass afficionados know a lot more about trad folk than today's folkies know about bluegrass.

Why? Well, they draw from the same well. They just use a different methodology? A different bucket to draw the water, so to speak.