Juan Bautista José Cabanilles (also Juan Bautista Josep, Valencian: Joan) was a Spanish organistand composer at Valencia Cathedral. He is considered by many to have been the greatest Spanish Baroque composer. Many of Cabanilles's compositions are virtuosic and advanced for their time, but generally, he is in the Spanish tradition of keyboard music following 16th century patterns. The majority of his manuscripts are kept in the Biblioteca de Catalunya in Barcelona. Numerous compositions for organ (tientos, toccatas, passacaglias, and other works) have survived, as well as a number of works for choirs of up to 13 parts.