Nice discussion guys. Enjoyed.

All I can add is we always knew if you strayed too far from tempo the adjusting would cause problems. I was not aware that a key change also could cause an issue, but makes sense. But to my ears, not much difference in the examples.

Having said that I can tell you I drink cheap beer and don't drink "call" whisky. Could never tell the difference and never wanted to develop such a refined taste that I needed to pay extra for the buzz.

However, I do appreciate and envey a little the tuned ears of the pros.