New Grass Revival was an influential American progressive bluegrass band that played from 1971 to 1989. Their style was characterized by extensive use of improvisation, unusual instrumentation, and fusion with other genres like jazz and rock, marking a distinct departure from traditional bluegrass. Notable band members included Sam Bush, John Cowan, Courtney Johnson, and later, Béla Fleck, whose virtuoso banjo playing became a signature sound of the group. Their influential works, such as their Grammy-nominated album "New Grass Revival" (1972) and "Friday Night in America" (1989), significantly impacted the evolution of bluegrass music.