I absolutely love Pat Metheny, and I especially love his records with the Pat Metheny Group from the 80s/90s. What I fail to understand though, is how those singers (who I presume are male) hit those insanely high notes. I can't even begin to do that--but then again, I'm not a professional singer. Anyway, do you think it was an immense amount of practice, or did they have naturally high voices?