Tony Iommi, Black Sabbath guitarist and co-founder, told UK broadcaster ITV that Osbourne was “frustrated” during the band’s farewell concert on July 5. The heavy metal icon died less than three weeks later, on July 22, at age 76.

Ozzy Osbourne and Black Sabbath headline the 'Back to the Beginning' charity concert, Saturday, July 5, in Birmingham, England. Here's how to stream.