The current roster of talent for the four-day outdoor event--which takes place June 12-15 this year at its traditional location, a 700-acre farm in Manchester, TN, about 60 miles south of Nashville--also includes Jack Johnson [ tickets ], Robert Plant [ tickets ] and Alison Krauss [ tickets ], Willie Nelson [ tickets ], Death Cab for Cutie [ tickets ], Sigur Ros [ tickets ] and about 60 other acts.

The full initial lineup for the festival is included below. Organizers expect the list to eventually grow to more than 100 musical acts and 20 comedians, according to a press release, with new names being periodically announced in coming weeks.

Tickets for the event will go on sale to the public starting Feb. 16 exclusively through the Bonnaroo festival's website.

In addition to music and outdoor camping, the event will offer "24 hours of activities," according to organizers, including a comedy theater, cinema festival, jazz club, silent disco, arcade, Internet cafes, restaurants, yoga classes and "high quality craft vendors."

The festival's "comedy tent" will feature Janeane Garofalo, Zach Galifianakis, Mike Birbiglia, Jim Norton, Brian Posehn and David Cross, who will host "Bonnaroo Late Time Chat About," which a press release calls "an original midnight talk show complete with a house band, comic skits and special guests."

Organizers of Bonnaroo (which is Cajun slang for "really good time") have placed an increasing emphasis on environmental awareness since the event's 2002 debut, and have taken steps to reduce or eliminate the environmental impact of the festival. Such measures include diverting 60 percent of the event's waste from landfills last year and replacing more than 25,000 gallons of diesel fuel with bio-diesel, according to a press statement.

Initial Bonnaroo lineup:

Pearl Jam
Metallica
Jack Johnson
Kanye West
Robert Plant & Alison Krauss
Phil Lesh & Friends
My Morning Jacket
The Allman Brothers Band
The Raconteurs
Willie Nelson
Death Cab for Cutie
B.B. King
Sigur Ros
Levon Helm and the Ramble on the Road
Ben Folds
O.A.R.
The Bluegrass Allstars Feat. Luke Bulla, Sam Bush, Jerry Douglas, Bela Fleck, Edgar Meyer and Bryan Sutton
M.I.A.
Umphrey's McGee
Iron & Wine
Yonder Mountain String Band
Swell Season
Talib Kweli
Derek Trucks & Susan Tedeschi’s Soul Stew Revival
Gogol Bordello
Broken Social Scene
Robert Randolph's Revival
Rilo Kiley
Mastodon
Lupe Fiasco
Against Me!
Sharon Jones & the Dap Kings
Pat Green
Ozomatli
Tegan & Sara
Solomon Burke
Drive-By Truckers
!!!
The Avett Brothers
Israel Vibration
Abigail Washburn & the Sparrow Quartet featuring Bela Fleck
Phil Lesh / Larry Campbell / Jackie Greene
Aimee Mann
Ladytron
The Fiery Furnaces
Orchestra Baobab
Ghostland Observatory
Jose Gonzalez
Dark Star Orchestra
Minus the Bear
Donavon Frankenreiter
Lez Zeppelin
State Radio
Battles
Jakob Dylan
Two Gallants
The Sword
Vampire Weekend
Little Feat
Nicole Atkins
The Felice Brothers
Mason Jennings
MGMT
The Lee Boys
Black Kids
Serena Ryder
Steel Train
Grupo Fantasma
Back Door Slam

Bonnaroo Comedy:
Bonnaroo Late Night Chat About with David Cross
Janeane Garofalo
Zach Galifianakis
Jim Norton
Brian Posehn
Mike Birbiglia
John Mulaney
Michelle Buteau