I bought this Andrew Bird Nobel Beast disc yesterday. And played it in the rental car on my way to visit family.
If you are named Andrew Bird, you should be fine-boned, with feather-like locks, you must warble, you must know what a whip-poor-will is, you must have a nice singing voice, you probably play violin, you fill your songs with stringed instruments: mandolins, maybe dulcimers, or other organic sounding things.
And you whistle. I mean, you are a world class whistler. You are a virtuoso whistler. And people are amazed at how good you whistle. You bring the house down with your whistling. Yes, Mr. Bird, you do.