The former members of Soundgarden are explaining their absence from Back to the Beginning, the epic Black Sabbath farewell show fronted by Ozzy Osbourne on July 5.

Here Are the Songs Black Sabbath Practiced but Didn’t Play at Farewell Gig—and Why originally appeared on Parade.

The metal pioneers’ original lineup — Iommi, Ozzy Osbourne, Geezer Butler and Bill Ward — performed last Saturday at Birmingham, England’s Villa Park, marking their first show together in 20 years. They closed out the all-day event with a four-song set comprising “War Pigs,” “N.I.B.,” “Iron Man” and “Paranoid.”