Having cut his teeth in the hard rock and alt-pop worlds, Butch Walker became the go-to producer for big-tent pop-rock in the ‘00s. Tracks like Panic! At the Disco's storming “Miss Jackson” and Weezer's jittery “(If You're Wondering If I Want You To) I Want You To” bridge the genre gap, combining forceful beats with frenetic guitars and irresistible hooks.