every stone has its own sound when working on it. Depending on the density of the stone one hears higher or lower sounds when carving or hammering on that stone. Granite stone has the highest frequency when working on it, since it is so dense. Crystalyzed marble sound more musical to me than normal white marble. So even working with stone becomes a musical experience to me. - And most of my works in stone are related to vibrational patterns of sound.