Tenacious D the Sunday Night Headliner for Outside Lands

​Tenacious D have been announced as the Sunday night replacement act for the Outside Lands festival.

The final spot for the August 30 concert was supposed to go to the Beastie Boys--but, as many of you'll recall, that group had to cancel all shows when Adam "MCA" Yauch was diagnosed with cancer a couple weeks back. (According to Rolling Stone, MCA has since undergone surgery, and is now recooperating at home.)

On an Outside Lands conference call this afternoon, Jack Black warned that dogs might be barking all day Sunday because canines know when there's a "gigantic rock storm coming."

What do you guys think? How do these replacement headliners hold up?