The folks behind the colossal Bonnaroo music festival have teamed up with a fast-growing Northern California concert promoter to launch a three-day music blowout in San Francisco's Golden Gate Park in August.

Ready to take over Golden Gate Park.

If the event's headliners are any indication, it should be a doozy.

Another Planet Entertainment and Bonnaroo promoter Superfly unveiled the Outside Lands Music & Arts Festival this week, lining up Radiohead, Jack Johnson, and Tom Petty as headliners. The event will take place August 22 to 24, with a full lineup, ticket prices, and on-sale dates to be unveiled in the coming weeks.

The event, which will span four stages and three massive fields within Golden Gate Park, is named for the region in the western half of San Francisco in which it is occurring. The area now known as the Sunset District and Golden Gate Park was known as Outside Lands in the 19th century, as the area was covered by sand dunes was largely inaccessible.

Radiohead

Superfly and Another Planet plan to make the event an eco-friendly affair and will make a "special annual donation" to the San Francisco Recreation & Park Department. According to the event's application to host the event, it plans to pay as much as $1.2 million to the parks department if the event is sold out for all three days. The organizers estimate attendance of between 35,000 and 45,000 people per day, not to exceed 60,000 in a day.

Outside Lands will come just weeks before the 2nd Annual Treasure Island Music Festival, which was widely praised as one of the better music festivals in the US in 2007.