“The Greatest Band on Earth,” Tenacious D will be on September 28th at Rock City World Stage. Versatile musicians, Jack Black and Kyle Gass are also actors. In 2006, they released their first feature film, Tenacious D in The Pick of Destiny. Shortly thereafter, “Rize of the Fenix” took Grammy for Best Comedy Album. From Los Angeles, the duo, formed in 1994, even recorded a series for HBO in 1999. Two years later, they released their maiden album, Tenacious D, certified platinum. The metal will strike you down in Rock City.