Ya know, we’re all fragile mortal humans. So was he.
There is often a mixture of mental illness and creative talent in some musicians, composers, artists, etc. Vincent Van Gogh being the poster boy:
https://m.youtube.com/watch?v=oxHnRfhDmrk
I get the impression he was like the Vincent of rock.
One thing is for sure: the guy had perfect pitch, a gift one is apparently born with.
RIP.