Ozzy Osbourne - Ozzy Osbourne Pulls Out Of Concert Over Vocal Concerns

The rocker was scheduled to perform an Ozzy Osbourne & Friends show at the Sap Arena in Mannheim, Germany, but according to online reports, a venue official disappointed fans by taking to the stage and announcing that the headliner couldn't perform due to a medical condition.

A representative for the rock legend tells Tmz.com Ozzy cancelled the show after issues with his voice. It's not yet clear if the gig will be rescheduled.

It's the latest health blow for Osbourne - his son Jack announced he has been diagnosed with multiple sclerosis on Sunday (17Jun12) and Black Sabbath bandmate Tony Iommi announced he was battling cancer at the beginning of the year (12).

It is not known if Osbourne's voice issues will prompt any more cancellations. At press time, his shows in Belgium and Italy scheduled for this weekend are still on.

It is also not known if Osbourne's health issues will impact the Black Sabbath reunion.