New Grass Revival was an American progressive bluegrass band active from the early 1970s to 1989. Known for blending traditional bluegrass with elements of rock, jazz, and folk, they were pioneers of the "newgrass" movement. The group featured highly skilled musicians, including Sam Bush, Béla Fleck, John Cowan, and Pat Flynn in its later lineup. Their innovative approach helped expand the boundaries of bluegrass music and influenced many modern acoustic artists.