Final answer:
The New Grass Revival fused bluegrass music with elements of rock to create a vibrant new genre.
Step-by-step explanation:
The New Grass Revival, formed in 1971, was known for its influential fusion of bluegrass music with elements of rock. This combination of the traditional acoustic string instruments and sounds of bluegrass with the electric instruments and the progressive spirit of rock music created a fresh and vibrant genre that appealed to a wide audience.
The band actively explored the boundaries of traditional bluegrass, incorporating the drive and innovation of rock, thus expanding the possibilities of bluegrass as a genre.