Band is forced to cancel concert after singer is briefly hospitalized for dehydration, stomach ailment.By MTV News staff Metallica's James Hetfield Photo: Lyle A. Waisman/ FilmMagic Metallica postponed their concert in Stockholm, Sweden, on Sunday after lead singer/ guitarist James Hetfield was taken to the hospital, according to The Associated Press. Organizers said 16,000 fans left the Stockholm Globe Arena without seeing the band perform. Spokeswoman Carolina Satterwall told the AP that Hetfield caught a stomach bug Sunday and suffered dehydration, but left the hospital that evening.