It's been a hot minute since my college days, but I do remember learning about singing as one possible avenue of speech therapy in one of my classes. Something about using different parts of the brain I guess.
Yup, it's a different part of the brain. My wife's speech and memory are still worse for wear after she suffered a series of strokes in her left hemisphere several years ago, but she can belt out any tune she's heard in the past fifty years like it was nothing.
Really? From his work in sabbath, he sounds like a crackhead stuck in a well, which is basically what he is.
And I'm a fan of Ozzy era sabbath, precisely because he sounds like a crackhead stuck in a well, wheras Dio is the far better singer. Which took away from the atmosphere of sabbath. That and Iommi for some reason started to write a lot more in line with other people in the 80s.