AC/DC has been forced to reschedule the 10 upcoming dates on the U.S. leg of their Rock or Bust world tour. Brian Johnson has been advised by doctors to stop touring immediately or risk total hearing loss, the band said in a statement. The shows will be made up later in the year, however it is likely that Johnson will not be along for the ride and AC/DC will enlist a guest vocalist. More information regarding the rescheduled shows is forthcoming. In the meantime, ticket holders can save their tickets for the rescheduled dates or receive a refund at point of purchase.