I Like Hayseed Dixie

But strumming a guitar and picking a banjo does not make something bluegrass. There is a specific instrumentation format and a limited set of traditional chord progressions.

There is no progressive or neo-XXX or any other type of bluegrass that qualifies for the label, much like there are no martinis made with anything but gin and no champagne made more than 100-ish miles from Paris.