Kinda like a cyborg. His voice is echoing or something. I've heard this in almost all of his performances in 80s in 1990 it gets to normal. Maybe he uses autotune? But I don't think so. If it was his natural voice, then it must be the most unique voice ever.

Edit: Damn I put the wrong video. This is what I supposed to use: https://www.youtube.com/watch?v=7VvrCxrXD20
Last edited by Grimmaydie at Jul 24, 2015,
It sounds like the usual Ozzy voice to me... no "cyborg" whatsoever, just a bit out of tune here & there, more noticeable when you are singing notes so long... a typical case of "I couldn't hear my monitor"/"I shouldn't have had that last beer before going into the stage"