Nicola Vicentino (1511 – 1575 or 1576) was an Italian music theorist and composer of the Renaissance. He was one of the most visionary musicians of the age, inventing, among other things, a microtonal keyboard.
Little is known of his early life. Born in Vicenza, he may have studied with Adrian Willaert in Venice, which was close by, and he acquired an early interest in the contemporary humanistic revival, including the study of ancient Greek music theory and performance practice (about which little was known, but was then being uncovered, through the work of scholars such as Girolamo Mei and Giangiorgio Trissino).
At some time in the 1530s or early 1540s he went to Ferrara, which was to become the center for experimental secular music in Italy from the middle to the end of the 16th century. Apparently he served as a music tutor to the Duke of Este as well as some of his family members, and some of Vicentino's music was sung at the court of Ferrara.