Dio was an American heavy metal band formed in 1982, led by vocalist Ronnie James Dio. The band is known for its powerful sound and theatrical performances, often incorporating fantasy and mythology into their lyrics. Dio gained popularity with albums like "Holy Diver" and "The Last in Line," which featured iconic songs that became staples in the heavy metal genre. The band's lineup changed over the years, but Dio remained a prominent figure in rock music until his passing in 2010. Dio is often credited with influencing many other artists and bands, solidifying his legacy in the world of heavy metal.