Colorado-based bluegrass-fusion band Good Gravy takes a familiar and somewhat overdone genre and bends and blends it into an innovative, exciting and tremendously entertaining “party grass” experience. Check it out tonight (Nov. 1) at the Stonehouse in downtown Nevada City. This five members of the band have become virtual masters of using bluegrass instrumentation, along with percussion, to push their bluegrass roots to new musical horizons, creating an innovative mix of bluegrass, funk, rock and psychedelic dance beats complete with imaginative improvisational jams and intricate compositions. Local bluegrass band Shingleman’s Mining Concern will open the night. Good Gravy’s always-evolving music …