I wonder the same thing and my only conclusion is, longevity. In order for Jon to get through a 2 plus hour night tour, this is how he needs to sing to protect his voice... or what's left of it...

The more I study and learn about the voice, Jon's 80s and early 90s singing style was a path to vocal destruction. His whale screaming sounded so good but it was so equally damaging. Jon did nothing to protect his voice back in the day except shoot it with steroids to mask the damage.

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