Brian Johnson (AC/DC) jumps on stage with the Foo Fighters

Wasn't it 5 years ago that Brian Johnson of AC/DC was retiring from the stage due to hearing loss? It's a modern medical miracle, I tell ya! 'Vax Live: The Concert to Reunite the World' was filmed Sunday night in California when Brian Johnson jumped onstage with the Foo Fighters to perform 'Back in Black'! I'm sure that made Dave Grohl's night. It would mine too! Hear it all happen Saturday night May 8 on the IHeartRadio app and watch it on ABC,CBS, Fox and YouTube.