Tool are one of the bands that will play the upcoming all-star “Back to the Beginning” concert featuring the final performances of Black Sabbath and Ozzy Osbourne. However, singer Maynard James Keenan says it may take “modern miracles” to get Ozzy onstage given the metal icon’s physical limitations.

The day-long concert at Villa Park in Birmingham, England, will also feature mini-sets from Metallica, Guns N’ Roses, Slayer, Pantera, Gojira, Alice in Chains, Halestorm, Mastodon, Lamb of God, Anthrax, and more, leading up to the final performances from Ozzy and Sabbath.

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In a new interview with Loudwire Nights (as transcribed by ThePRP), Keenan discussed how Tool became involved in the concert, as well as his concerns for Ozzy’s physical condition at the show.

Keenan performed as part of a tribute to Ozzy during the latter’s Rock & Roll Hall of Fame induction last year.