 Some of his sacred music uses instruments (a practice which is not uncommon in Spanish sacred music of the 16th century), and he also wrote polychoral works for more than one spatially separated group of singers, in the style of the composers of the Venetian school who were working at St. Mark's in Venice.His most famous work, and his masterpiece, "Officium Defunctorum", is a Requiem Mass for the Empress Maria.The following are recordings of music by Tomás Luis de Victoria.