Bonnie Raitt, Cake, and Concrete Blonde are among the rock acts confirmed for We The Planet, a music and activism festival set for April 20 (Earth Day) at Speedway Meadow in San Francisco's Golden Gat

Bonnie Raitt, Cake, and Concrete Blonde are among the rock acts confirmed for We The Planet, a music and activism festival set for April 20 (Earth Day) at Speedway Meadow in San Francisco's Golden Gate Park. Rap outfits The Coup and De La Soul are also on the bill, with additional performers to be announced in the coming weeks.

Headliner Raitt will give a unique acoustic performance at the special Earth Day concert, which will also boast speakers, national and local non-profit organizations, interactive and educational displays, art, and organic vegetarian cuisine. The concert will be powered by green energy sources like bio-fuel and solar, and according to the multi-cultural festival's official Web site, it will "model sustainability on every level of production and implementation." Tickets are $15 in advance and $20 at the point of entry.

In related news, an official E-mail newsletter sent yesterday (March 12) by the Red Hot Chili Peppers camp, titled "Red Hot Chili Peppers Support We The Planet!" endorsed the event, prompting fan speculation on the outfit's official message board that the group might also appear. Although the newsletter makes no mention of the quartet actually performing, the Chili Peppers' schedule is clear, should a surprise appearance arise.

The Chili Peppers -- whose friend Julia Butterfly Hill organized We The Planet -- wrap the European leg of their world tour March 29 in Stockholm. The group doesn't resume roadwork until April 27, when it launches eight weeks of U.S. dates as headliners on the second night of the Coachella Valley Music and Arts Festival in Indio, Ca.

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