Schnell was a member of the original Dio lineup alongside guitarist Vivian Campbell, bassist Jimmy Bain and drummer Vinny Appice. They reunited under the Last In Line name in 2013, and recruited vocalist Andrew Freeman to front the band.

Campell, also a member of Def Leppard, says: "The initial idea was to reunite the original Dio band to play the songs we wrote and recorded with Ronnie in the early 1980s. It was a limited ambition, but one that brought us great joy in reconnecting to this great music, to each other, and to our collective history.

"Our ambition at that time didn't extend to writing and recording any new music, but when we were offered the opportunity to do so by the Frontiers record label, we took that step forward."

Campbell adds that the band decided to mimic the procedure they undertook with 1983 Dio debut Holy Diver, which was written without keyboards in mind. He continues: "After Holy Diver was recorded we brought in Claude to embellish certain songs in a way that the guitar just couldn't do. From that time forward Claude became an essential part of the band's live shows.