Those who've followed Troy Campbell through his evolution over the years, from the punk-wired Highwaymen, to Americana-drenched Loose Diamonds, and now three albums into a stellar solo career, have always known he's a restless soul. It's written in his songs, which flit between a jumpy, let's-blow-this-town urgency, and more sorrowful expressions of longing, hope, idealism. And it's there in his remarkable voice, a uniquely expressive instrument comfortable with everything from jagged murder ballads to four-on-the-floor Chuck Berry rockers to candlelit love songs.