These days the term “Bluegrass” encompasses a broad range of musical expressions. From the down home, gutsy realism of first-generation entertainers like Ralph Stanley, Bill Monroe and Flatt & Scruggs to the more refined sounds of Alison Krauss to the outer fringes of what is technically and musically possible and still retain some semblance of the core sound. It is indeed a broad genre that continues to give birth to new broods.
All that said, “A Town Called Normal,” in my opinion, does not fit into any honest, objective interpretation of Bluegrass music. Does it have a banjo on most cuts? Yes. Is there a mandolin? Sometimes. However, those characteristics alone do not a bluegrass band make.