Instruct: Classify a given review as either positive or negative.
Query: Leading their own group since '48, they hit the top in '62...

I used to have a double cassette of Flatt and Scruggs early '50's work on the Mercury label, and while it was good, it did not have the mass appeal the group achieved in the early '60's, when doing the theme song for the hit TV comedy "Beverly Hillbillies" introduced Bluegrass to many millions. Something about this particular assemblage of pickers, and the material they recorded for Columbia, just plain clicked. Personally, as only a casual fan of Bluegrass, I would say this concert is a four-star event, musically, here in the new century. However, it was an historical moment when their Appalachian sounds were offered from the stage which had hosted every famous classical performer of the 20th century. So add a star because the mountains battled Manhattan on that December night in '62, and the mountains won.