Sinsull, for sake of categorizing, what you have suggested is old style country music like the brother acts with the tight harmonies.

I feel that what is described as old-timey string band music is devoid of those harmonies.

I do totally agree that the old-timey string band music is more dancable whereas bluegrass is for listening and performance orientated.

This is what really separates the men from the boys, as the bluegrass audience and musicians is by far more discriminating and sophisticated musically due to the aforementioned structure (beginning, middle, and end), along with stronger talents needed for breaks, group dynamics (not everyone playing at the same volume all at once), not to mention smooth vocal abilities needed for solos and harmonys.