On their debut, Ghost put some hum into heavy metal. Inspired by the genre’s more melodic sounds from the ’70s and ’80s, the satanic Swedes build darkly alluring songs from glassy harmonies, headbanger heft, and occult atmospheres. On “Elizabeth,” Beatles-esque hooks and funereal organ coil themselves around doom riffs; equally catchy is “Stand by Him,” an ode to Lucifer laced with tuneful twin leads. The chugging “Con Clavi Con Dio” is way heavier, and the Black Mass-like voices woven throughout make for one potent earworm.