Stryder Callison just got a new app for his iPhone. “Voice Tutor” is a vocal warm-up that helps singers like himself perfect pitch, and it’s a sign that the local rocker’s old habits—he “used to smoke cigarettes, stay up until six, and scream” the night before a show—are long gone. He’s finally taking himself seriously. After recording his first solo album, Years in the Making, Callison learned first hand what happens when you push your voice to its limit. “The more you abuse your vocal cords, it creates a little red bump,” he says. “When you sing or even talk, your vocal cords won't vibrate at the right speed.” Callison's late night jam sessions earned him a vocal polyp—a swollen growth on one of his vocal cords—that Whitney Houston and Julie Andrews can sympathize with. Over the following year, Callison began repairing his voice by allowing himself to speak for only one minute every hour.