Carrie Underwood on what she wishes were different about her voice:
"I'm competitive. When I hear somebody else do something I can't, it drives me nuts. Steven Tyler–that screamy thing he does? I can't do that. I have too much control over my voice. Or people like Mariah Carey, who can do whistle tones [notes that are at the highest point of the vocal register]. I've tried, but I can't train myself to do it."