The only thing guaranteed with a Panic! At the Disco record is change. On their fourth album, the quartet’s restless genre-sampling takes in lascivious hip-hop (“Miss Jackson”), gothic disco (“Girl That You Love”) and ’80s synth pop (“Girls/Girls/Boys”), while “Nicotine” partly exhumes the electro-emo of their early career. Inspired by their hometown of Vegas, it’s a suitably slick, neon-lit album that tastes the parties and hangovers in equal measure.