Organizers expect to host more than 100 bands and 20 comedians on 13 stages during the four-day rock festival. They tout Bonnaroo as the largest and only round-the-clock music and camping event in the US.

A slew of additional acts are already booked, and more will be announced in the coming weeks, according to a press release. Confirmed artists are listed below. Tickets go on sale Feb. 23 exclusively at Bonnaroo's website.

Besides music, the fest offers 24-hour-a-day activities, including a comedy club, cinema, silent disco, arcade, Internet cafes, restaurants, yoga classes and craft vendors.

"Being a four-day, 24-hour event has put us in a unique position to create entertainment options that go way beyond what a fan gets to experience at a normal concert or festival," Rich Goodstone of Superfly Productions said in a statement. "You can come to Bonnaroo and catch a set by a headlining comedian, create your own mix CD, taste beers at our brewer's festival, hook up with an environmental organization or see a new documentary film--and that's just scratching the surface."

Bonnaroo's onsite comedy club has become an integral part of the event, and this year will host Lewis Black, David Cross and Dave Attell.

In addition to its reputation for supplying a wide-range of entertainment, Bonnaroo is becoming known for its environmental friendliness, raising awareness among patrons and taking significant steps to reduce or eliminate its environmental impact. Last year, the fest diverted 60 percent of its waste from landfills and replaced more than 25,000 gallons of diesel fuel with bio-diesel, according to a statement.

In a move to secure the fest's long-term stability, Bonnaroo's principles recently purchased a major portion of the 700-acre Tennessee farm that hosts the event, according to a press release.

Initial Bonnaroo lineup:

The Police
Tool
Widespread Panic
The White Stripes
Ben Harper & the Innocent Criminals
Wilco
The Flaming Lips
Manu Chao
The String Cheese Incident
Franz Ferdinand
Bob Weir & Ratdog
Damien Rice
Ween
Gov’t Mule
Ziggy Marley & the Melody Makers
The Decemberists
Kings of Leon
Michael Franti & Spearhead
Wolfmother
Regina Spektor
Galactic
The Black Keys
DJ Shadow
Gillian Welch & David Rawlings
Spoon
Keller Williams (WMD’s)
Sasha & John Digweed
STS9
Old Crow Medicine Show
The Hold Steady
North Mississippi Allstars
Fountains Of Wayne
Hot Tuna
Feist
Hot Chip
Lily Allen
John Butler Trio
Ralph Stanley & the Clinch Mountain Boys
Aesop Rock
The Richard Thompson Band
Dierks Bentley
Xavier Rudd
Gogol Bordelo
Junior Brown
Tortoise
T-Bone Burnett
Mavis Staples
Clutch
Cold War Kids
Dr. Dog
Paolo Nutini
Brazilian Girls
RX Bandits
The Nightwatchman
The Slip
Girl Talk
Railroad Earth
Martha Wainwright
Rodrigo y Gabriela
Annuals
Tea Leaf Green
Sam Roberts Band
Elvis Perkins in Dearland
Charlie Louvin
Sonya Kitchell
Mute Math
Apollo Sunshine
Uncle Earl
James Blood Ulmer
The National
The Little Ones
Ryan Shaw

Comedians:

Lewis Black & Friends
Dave Attell
David Cross