According to VirtualFestivals.com and NME.com, KORN frontman Jonathan Davis has had to pull out of his scheduled appearance at U.K.'s Download festival, taking place at Donington Park. But the band will play on, with some "very special guests" (including SLIPKNOT/STONE SOUR frontman Corey Taylor, according to Kerrang! Radio) filling in on vocals.

The singer was admitted to an unspecified U.K. hospital earlier, although there are currently no details on his condition.

The rest of KORN are scheduled to appear on Download's Main Stage at 6:30 p.m. today. The band will play a shortened 30-minute set, with a variety of guests (including the aforementioned Taylor) helping out on vocals. Click here to view a photo of the members of KORN announcing the illness and non-appearance of their lead singer Jonathan Davis on the main stage of Day 2 of the Download Festival on June 10, 2006 in Castle Donington, England.

METALLICA, who are headlining straight after KORN, famously endured a similar card of fate at this same festival in 2004, when drummer Lars Ulrich was unable to play due to illness at the eleventh hour. SLIPKNOT and SLAYER were among bands that donated their stickmen to fill Ulrich's stool and the resulting show went down as a historical event in Donington's rich rock tapestry.

Furthermore, speculation is rife that METALLICA frontman James Hetfield may be amongst the Korn Karaoke contenders, given that Jonathan Davis once stood in for him at a METALLICA show, when he was unable to perform due to injury.