The second Bonnaroo festival has signed on nearly 20 additional acts, including Neil Young & Crazy Horse, the Flaming Lips, Emmylou Harris, Alison Krauss + Union Station featuring Jerry Douglas, the Funky Meters, Leo Kottke and Mike Gordon, and Spearhead. As previously reported, the event, set for June 13-15 in Manchester, Tenn., will be headlined by the Dead and Widespread Panic.

Other newly added acts include Ben Kweller, Cyro Baptista and Beat The Donkey, the Slip, My Morning Jacket, DJ Spooky, the Polyphonic Spree, Drive-By Truckers, and Vuhi Mahlasela of the film "Amandla!"

They join previously announced artists Sonic Youth, James Brown, Ben Harper & the Innocent Criminals, Tortoise, the Roots, Warren Haynes, Bela Fleck & the Flecktones, moe., Medeski, Martin & Wood, Jack Johnson, Galactic, Sound Tribe Sector 9, G. Love & Special Sauce, O.A.R., Antibalas Afrobeat Orchestra, Nickel Creek, Keller Williams, Kid Koala, Mix Master Mike, RJD2, and DJ Z-Trip.

Bonnaroo will again take place on a 600-acre farm in Manchester, 60 miles south of Nashville, and concertgoers are encouraged to camp on the grounds. According to the event's official Web site, a limited amount of tickets remain available through various outlets.