The Boston Globe reports that DISTURBED's previously announced U.S. tour has been canceled because the band's lead singer, David Draiman, has been diagnosed with a serious throat condition.According to tour promoter Live Nation, the unspecified "condition" is not permanent, but Draiman must stop performing for at least four weeks in order for it to heal. Refunds are available at point of purchase. Draiman in 2006 underwent successful surgery to fix a deviated septum which was making breathing difficult and affecting his vocal abilities on stage. Draiman told a California radio station last month that the band will be doing two legs of its Music As A Weapon tour in 2011. Draiman did not reveal the lineup, but said, "The co-headliner for the tour [rumored to be KORN. — Ed.] is massive. And it's going to be appearing in a union that I think hard rock and heavy metal fans have been wanting to happen for awhile. It has happened before, but only in brief stints. Now it's gonna happen for the duration of a two-leg-long tour. And we're gonna join forces with a leviathan. And we're really looking forward to it." Previous Music As A Weapon lineups have included CHEVELLE, STONE SOUR, DROWNING POOL, ALTER BRIDGE and others. DISTURBED's fifth studio album, "Asylum", arrived on August 31 and debuted at No. 1 on the Billboard album chart, the fourth consecutive release from the group to do so.