As previously noted, festival organizers all over the country have been having to replace the Beastie Boys, who cancelled their tour due to MCA having to undergo surgery for cancer.

Today, via Twitter, San Francisco's Outside Lands Festival announced that they were replacing the Beastie Boys with "the greatest band in the world": Tenacious D, the musical comedy duo featuring Superstar Jack Black and Kyle Gass.

The 2nd annual All Points West festival kicked off today in Jersey City, NJ. The 3 day concert is aiming to become the East's answer to Goldenvoice's other creation, Coachella. Originally slotted for tonight's headliner was the Beastie Boys, who were replaced by Jay-Z after the Beasties canceled their tour due to Adam Yauch aka MCA undergoing surgery for cancer.

Tool headlines tomorrow night, with Coldplay closing out the festival on Sunday.

In very unfortunate news revealed yesterday, MCA, nee Adam Yauch, of the Beastie Boys has cancer in his parotid gland and will begin undergoing treatment next week. Yauch, with longtime bandmate Ad Rock at his side, made the announcement candidly and fearlessly via video.

Enjoy this performance of "Rhymin' and Stealin'" from 1987 and go leave MCA a get well comment on the Beastie Boys Facebook Page.

Hip-Hop fans got some sad news today. Adam Yauch, aka MCA, one third of the legendary hip-hip trio Beastie Boys, announced that he had a cancerous tumor that needed immediate attention.

In a video statement released by the band, MCA explains that the doctors caught it early enough that there should be no problem in getting it out without it coming back. However, the group will be canceling their upcoming summer tour and push back the release date of their new album.

Get well MCA -- our hearts go out to you.