As a demonstration of the full power, complexity, and majesty of the human voice, there can be no better showcase than Rachmaninoff’s epic All-Night Vigil. Ten of the 15 sections are based on chants of the Russian Orthodox Church and in the other five sections, Rachmaninoff creates an evocative spiritual testament to his Russian homeland. Past performances by the Los Angeles Master Chorale cemented its reputation as a top-flight choral group.