If you haven’t yet heard of Blake Mills, then brace yourself. Tracked at Hollywood’s fabled Ocean Way Studios with a gang of ace musicians—including Fiona Apple, Don Was and all-around force of nature Jim Keltner—Mills’ sophomore album has the trappings of a cosmic rock classic, and not just because of the star power. At 28 and already a session vet, he’s just coming into his own as a singer-songwriter, so when Mills pours his soul, his guitar and his production touch into the string-heavy ballad “Half Asleep” or the sanctified “Just Out of View,” they seem to echo across great distances straight out of Zep’s Houses of the Holy or Jackson Browne’s For Everyman. Add exotic guitarcana galore and a country-blues bent that makes the most of Apple’s guest vocals—check out the hip-rolling “Don’t Tell Our Friends About Me”—and Heigh Ho stands up as a tunefully crafted stroke of quiet, confident genius.