Originally Posted by Butters

I was speaking to somebody recently who had a mild stroke (in their basal ganglia - brain stem). This person had very few symptoms after the stroke other than completely losing their ability to sing. This person wasn't a professional singer or anything but their voice had been affected. Speaking voice was noticeably more "scratchy" and "thin" and could not sing in tune anymore.

I wonder (wild speculation, yes) if perhaps something similar may have occurred to Jon.