Tenacious D -- comprising of superstar comedian Jack Black and Kyle Gass -- will be performing at the Outside Lands music festival in San Francisco on Aug. 30, a headlining slot previously occupied by Beastie Boys.

The duo has been largely quiet since the release of the movie and soundtrack to "The Pick of Destiny" in 2006, and a subsequent tour in 2007. Black, of course has been acting in and lending his voice to movies like "Year One," "Kung Fu Panda" and "Tropic Thunder" since then. Tenacious D also released a DVD last year, "The Complete Masterworks 2," chronicling the "Pick Of Destiny" tour and its crash-and-burn at the box office.

As previously reported, the Beastie Boys had to cancel several tour and festival appearances due to Adam "MCA" Yauch's cancer diagnosis. Jay-Z subbed at All Points West, while the Yeah Yeah Yeahs will play the Beasties' slot at Lollapalooza on Saturday.

This particular subsitution is a propos, though, that their replacement is a crew who also know how to bring the funny.

Tenacious D have reportedly had plans to complete a third album, "Death Star."