Deep Purple enjoyed the enviable title of being heavy metal heavyweights, but despite this, there was one disastrous album that nearly destroyed them entirely.

They were legendary and not just former lead singer Ozzy Osbourne ... Sabbath as well as Led Zeppelin and Deep Purple for the unholy trinity of heavy music in the early 1970s.

as opposed to three or more lead singers. And I’m not talking here about bands who simply got a new singer when one guy left.