Juan Bautista José Cabanilles (1644-1712) was a Spanish organist and composer at Valencia Cathedral. He is considered by many to have been the greatest Spanish Baroque composer. He probably began his musical career as a singer in a choir of a local church. Later he studied to become a priest in the cathedral at Valencia, which included lessons in music. On 15 May 1665, at 20 years of age, he was named the assistant organist of the cathedral. A year later, upon the death of his predecessor, he became the principal organist. On 22 September 1668 he was ordained as a priest. He kept his position as principal organist for 45 years. From 1675 to 1677 he also took charge of teaching the children in the cathedral choir. No portrait or likeness of Cabanilles is known to exist; the portrait here published is of the botanist Antonio José Cavanilles (1745-1804).