Geezer Butler, Black Sabbath's iconic bassist, was spotted enjoying a Backstreet Boys concert in Las Vegas, humorously sharing his ‘audition’ for the band on Instagram after his 76th birthday.

Watershed rock and roll moments like these are explored in detail at Amplified, a new immersive experience that opened earlier this month at Illuminarium Atlanta.

The Backstreet Boys have kicked off their summer residency at The Sphere in Las Vegas. Buy tickets to Backstreet Boys Sphere ...