Many factors determin the sound of an instrument: construction, player, environment, to mention a few. But I'd like to focus on what I consider the primary factor, The Material Of the Body. As a "brass player," I am interested in knowing about the different qualities of brass used to construct a trumpet; not the thickness. There are different grades of silver and gold. There must be different grades of brass. Does anyone know what grade of brass is used to construct the most revered trumpets?