Donald Martino’s Notturno (1973) is both his most well known work and is among his most conceptually impenetrable. The composer’s publicly shared observations reveal little of the work’s deep formal and conceptual procedures by describing the work as being “about the diversity of feeling that I undergo daily when I contemplate my life at that moment before sleep.” Naturally this diversity manifests itself in a myriad of formal and conceptual ways representative of the composer’s...