June 24 [16:00 EDT] -- This year's version of Lollapalooza launches on Wednesday in West Palm Beach, Florida, but Dr. Octagon won't be on-hand.

Publicists for Dr. Octagon, which was scheduled to play the second stage during the first leg of the tour, said that the act has been dropped from the tour because Kool Keith, whose wacked-out raps help define Dr. Octagon's techno-raunch sound, has not been heard from since agreeing to be part of the tour.

Instead, fans at the first Lolla date on Wednesday will have to make due with a second stage set from festival organizer Perry Farrell's Porno For Pyros. On Friday, when the tour rolls into Atlanta, Interscope Records' Artificial Joy Club will assume a spot on the second stage.

Meanwhile, Dr. Octagon fans may just have to content themselves with the two new albums, "Dr. Octegonecologist," and "Instrumentalist."