Originally an outlet for GYBE! founder Efrim Menuck’s piano compositions, A Silver Mt. Zion has grown in name and scope over the last 10 years. 13 Blues for Thirteen Moons expands on Menuck’s apocalyptic vision. Opener “1,000,000 Died to Make This Sound” has all the elements of a classic ASMZ epic: guitar and violin crescendos, choir vocals, and Efrim’s trademark yelp. Elsewhere, the 15-minute title track breaks new ground for the band with Black Sabbath-esque guitars, while “Black Waters Blowed/Engine Broke Blues” hits a few heavy, dark climaxes. All of this builds to the moving perfection of “Blindblindblind,” where layered guitars build a symphonic funeral march.