Black Sabbath mastermind Tony Iommi has revealed the biggest difference between his Sabbath bandmates, Ozzy Osbourne and Ronnie James Dio in a recent question and answer session on social media.

A fan named Lair Hull asked:

“Tony, when the band broke off with Ozzy and merged with Ronnie James Dio, did you intentionally set out to create a such a new and different sound from that of previous Sabs?

Heaven and Hell album is such a powerhouse yet a brilliant departure from the traditional Sab sound. On its own merit, it’s as good as any Ozzy Sabbath. “

Tony responded:

“Ronnie didn’t sing the riff so writing was very different, he has his own style and we met in the middle.”

Another fan named Paul Arthur asked:

“hi Tony, how do you pick people to collaborate with & have you got any projects going on?”

Tony replied:

“Hello Paul. I listen to what people are doing, and I also need to get on with them. The project for now is mixing Forbidden.

See the tweet below.