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well from one professional musician to another, i don't know much about bluegrass but I would think it has Celtic beginnings. The clogging and all-- many irish, scottish and others of that region settled in the Appalachians and begin having their saturday night jam sessions, one person play a bit another joined in, and another until it became a cacophony of whoops and hollers, pickin' and grinnin' and good times dancing do si do. and all that! LOL..  I don't play bluegrass but I do enjoy listening to a group of 'pickers' go at it..  I guess its my Midwestern roots..They have lots of bluegrass there..  I leave early though, to avoid the flying jugs later on in the evening.. :)