Neil Young has just announced the line up for his 21st Bridge School Concert to be held at Shoreline Amphitheater in Mountain View, California on October 27 and 28. Always released the week before Farm Aid, Young and his manager Elliot Roberts have tapped a few returnees and two new bands for the two-day unplugged benefit concert that funds the Bridge School, an alternative education program in the San Francisco Bay Area for children with physical disabilities and speech difficulties that was founded by the musician and his wife Pegi, and inspired by their son Ben's cerebral palsy.

This year, Metallica will headline the show, and if it's anything like their 1997 appearance, it will show what these iconic headbangers are made of once faced with playing acoustic. One clue: It's as revealing as Some Kind of Monster. Also, for the second time is Jerry Lee Lewis, who burned up the stage last year; Eddie Vedder, not with his usual configuration, but with Red Hot Chili Peppers bassist Flea; and Jack Irons, who played in both the Peppers and currently in Pearl Jam. Tom Waits will be on board for his second appearance, but this time he has co-opted Elvis Costello's eccentric pals: the Kronos Quartet, John Mayer fresh from his "green light" tour, Tegan & Sara, who are signed to Young's Vapor Records, Regina Spektor, the quirky Russian-born warbler, and Pegi Young, along with some of the players who were on her husband's Prairie Wind record.

Tickets will go on sale this Sunday, September 9 at 10 a.m. at Livenation.com and all Ticketmaster outlets. Proceeds from these auction tickets will benefit the Bridge School.