Tenacious D, also known as The D, is an American rock band composed of actor/musicians Jack Black (JB) and Kyle Gass (KG). Their style meshes rock with other musical styles such as folk metal and at times comedy rock. They are known for their upbeat classic rock style and vulgar comedy. The band first gained popularity in 1999 when they starred in a self-titled HBO television series, in which Black and Gass established themselves as The D and the Greatest Band in the World. The series is occasionally rerun on the Comedy Central network. They are also included in the DVD The Complete Masterworks.