BUTCH WALKER One of pop’s hottest producers likes to play rough—when they let him By Michael Gallant Butch Walker’s not only a jack of all musical trades, he’s a master as well. From the producer’s chair, Butch Walker has crafted hit records for everyone from Pink, Fall Out Boy, and Keith Urban to Avril Lavigne, Taylor Swift, and Katy Perry. From the stage and studio, he’s the frontman of Butch Walker and the Black Widows, which has...