His powerful piano-based ballads always hit hardest, but Todd Rundgren loves throwing stylistic curveballs. Check out “I Just Want to Touch You” from his group Utopia, an exuberant whoosh of handclaps, harmonica, and mop-topped harmonies, or “Chain Letter,” a plaintive track in a constellation close to Big Star. He even fronted an updated version of The Cars, welding his chunky power pop to their gleaming New Wave on “Not Tonight.”