The reformation of the Afghan Whigs, a performance of Slayer's "Reign in Blood" and a set by co-curator Mogwai will highlight I'll Be Your Mirror 2012, an All Tomorrow's Parties event taking place May 25-27 at Alexandra Palace in London.

The festival will also feature performances by the Melvins, Mudhoney, the Dirty Three, Archers of Loaf, Chavez, Sleep, Codeine, Yuck and more. Guided By Voices was planning to perform at the festival but canceled due to the group's latest break-up, according to ATP organizers, who are offering refunds to those who have already purchased tickets.

I'll Be Your Mirror marks the first performance of the Afghan Whigs in 13 years; the Cincinnati group split up in 2001 after six albums -- including the highly regarded "Gentlemen" in 1993. The group reunited briefly in 2006 and recorded a pair of new tracks for the compilation "Unbreakable: A Retrospective 1990-2006," but has since been dormant. Frontman Greg Dulli founded the Twilight Singers and, with Sreaming Trees' Mark Lanegan, the Gutter Twins and also performs as a solo act. John Curley plays in the Staggering Statistics and Rick McCollum is part of Moon Maan.

The Whigs will also headline the I'll Be Your Mirror USA 2012 show on Sept. 22 in Asbury Park, N.J. Tickets will go on sale in early January.

Tickets for the British I'll Be Your Mirror, meanwhile, are on sale now via ATPFestival.com. The current festival lineup -- with more acts to be announced -- includes:

May 25: Slayer, Sleep, the Melvins, Wolves in the Throne Room, Yob

May 26 : Mogwai, the Dirty Three, Codeine, Mudhoney Chavez, Floor

May 27: The Afghan Whigs, Archers of Loaf, Yuck, Demdike Stare, Siskiyou