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.

The original Black Sabbath lineup — Osbourne, Iommi, Butler and Ward – reunited on July 5 for the Back to the Beginning concert in their hometown of Birmingham, England. The band performed before an audience of 42,000 at Villa Park, marking their first show together since 2005.

Bassist Terence “Geezer” Butler, guitarist Tony Iommi, lead singer Ozzy Osbourne, and drummer Bill Ward were all between the ages of 18 and 20 when they began playing together in Birmingham. Naming themselves after an Italian horror film in early 1969,