I had a colleague who was a stutterer (and he knew it). If we needed to talk about TSO CLISTs, we knew we were in for a long winter.
From what little I know, it is a wiring problem. But singing uses a different part of the brain.
Now using the part of your brain to use the LANGUAGE of the country you LIVE IN (I assume) is a whole different proposition...
I didn't want to laugh, but that's funny!