What separates an OK whistler from a champion?

First, it has always made me sad when people who like to whistle won’t whistle around me. I promote and encourage whistling by anyone who can eke out a sound with pursed lips. My wife Kristen likes to whistle and I encourage her to keep working at it. As with amateurs and pros in sports, there are differences among whistlers. There are a number of things that separate an amateur whistler from a champion: technical ability; purity of sound; accuracy of pitch; interpretive and arrangement skills; presentation skills; and enthusiasm. And then there’s practice, practice, and more practice!