ACDC Singer Brian Johnson Forced by Doctors to Reschedule Upcoming Tour Dates

ACDC front man Brian Johnson was forced by doctors to reschedule a handful of upcoming tour dates and take some time off or he could risk total hearing loss.

The 68 year old singer is unsure if he'll be able to start the European leg of the tour later this year. This leaves Angus Young as the only founding member of the band to finish out the tour which will most likely take on a guest vocalist. The founding rhythm guitarist , and Angus' brother, Malcolm Young had to retire due to dementia.

The band parted ways with long time drummer Phil Rudd last year after Rudd was convicted in a New Zealand court for threatening to kill an employee.

The delayed shows include a concert in Atlanta on Tuesday (local time) as well as an April 4 show at Madison Square Garden in New York.

It remained unclear whether the band would be able to pursue the European leg of their Rock or Bust tour, which is scheduled to begin on May 7 in Lisbon.

AC/DC has sold more than 200 million albums since 1973 with Back in Black among music history's top sellers.

Johnson, known for his trademark cap and a voice that strains the vocal cords, joined the band in 1980 after singer Bon Scott died following a night of heavy drinking.