Monserrate served for the chapel of St Martin in Valencia where he wrote a plainsong discourse entitled “Arte breve, y compendiosa de las dificultades que se ofrecen en la musica practica del canto llano.” That is among the just theoretical functions on music from Spain released through the seventeenth hundred years. He was unsympathetic toward the amateur musician who understood nothing regarding the solid and traditional foundations from the musical arts. Monserrate’s personal treatise paid great homage to earlier authorities. The task was split into two servings: basic principles and good examples. Historically his function became essential in Spainish musical theory since it was frequently quoted by later on theorists. The corpus of the task contained the most common types of notation, accidentals, cadences, settings and solmization.