What is the literal sense of the German voice classification system used to identify voice types?
Fach The German Fach system (] ; literally "compartment" or "subject of study", here in the sense of "vocal specialization") is a method of classifying singers, primarily opera singers, according to the range, weight, and color of their voices. It is used worldwide, but primarily in Europe, especially in German-speaking countries and by repertory opera houses.
Tessitura In music, tessitura (] , pl. "tessiture", "texture"; ) is the most esthetically acceptable and comfortable vocal range for a given singer or, less frequently, musical instrument; the range in which a given type of voice presents its best-sounding (or characteristic) timbre. This broad definition is often interpreted to refer specifically to the pitch range that most frequently occurs within a given part of a musical piece. Hence, in musical notation, "tessitura" is the ambitus in which that particular vocal (or less often instrumental) part lies—whether high or low, etc.