At the end of her July 22 Mayhem Ball performance in San Francisco, Gaga exposed an Ozzy Osbourne T-shirt underneath a black leather jacket, then played his 1980 debut solo single “Crazy Train” as she and her dancers walked a catwalk.

The music world is mourning heavy metal legend Ozzy Osbourne’s death at the age of 76. Known as the godfather of metal and the iconic frontman of Black Sabbath, Osbourne died just weeks after his final concert at Villa Park in Birmingham.

Luminaries of the music world mourned the death Tuesday of Ozzy Osbourne at age 76, expressing affection and admiration for the heavy metal icon.