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Gioseffo Zarlino (January 31 or March 22, 1517 – February 4, 1590), was an Italian music theorist and composer of the Renaissance. He was possibly the most famous music theorist between Aristoxenus and Rameau, and made a large contribution to the theory of counterpoint as well as to musical tuning.

Zarlino was born in Chioggia, near Venice. His early education was with the Franciscans, and he later joined the order himself. In 1536 he was a singer at Chioggia Cathedral, and by 1539 he not only became a deacon, but became principal organist. In 1540 he was ordained, and in 1541 went to Venice to study with the famous contrapuntist and maestro di cappella of Saint Mark's, Adrian Willaert.

In 1565, on the resignation of Cipriano de Rore, Zarlino took over the post of maestro di cappella of St. Mark's, one of the most prestigious musical positions in Italy, and held it until his death. While maestro di cappella he taught some of the principal figures of the Venetian school of composers, including Claudio Merulo, Girolamo Diruta, and Giovanni Croce, as well as Vincenzo Galilei, the father of the astronomer, and the famous reactionary polemicist Giovanni Artusi.

While he was a moderately prolific composer, and his motets are polished and display a mastery of canonic counterpoint, his principal claim to fame was his work as a theorist. While Pietro Aaron may have been the first theorist to describe a version of meantone, Zarlino seems to have been the first to do so with exactitude, describing 2/7-comma meantone in his Le istitutioni harmoniche in 1558. Zarlino also described the 1/4-comma meantone and 1/3-comma meantone, considering all three temperaments to be usable. These are the precursors to the 50- 31- and 19-tone equal temperments, respectively. In his Dimonstrationi harmoniche of 1571, he revised the numbering of modes to emphasize C and the Ionian mode, thereby drawing closer to the harmonic and melodic system basing itself on tonality and the major and minor scales.

Zarlino was the first to recognize the primacy of the triad over the interval as a means of harmonic thinking. His development of just intonation came from a realization of the imperfection of the intervals in the Pythagorean system, and a desire to retain as much purity as possible using a limited number of tones. He was also the first to attempt an explanation of the old prohibition of parallel fifths and octaves as a rule of counterpoint, and the first to study the effect and harmonic implications of the false relation.

Zarlino's writings, primarily published by Francesco Franceschi, spread throughout Europe at the end of the 16th century. Translations and annotated versions were common in France, Germany, as well as in the Netherlands among the students of Sweelinck, thus influencing the next generation of musicians who represented the early Baroque style.

Zarlino's compositions are more conservative in idiom than those of many of his contemporaries. His madrigals even avoid the homophonic textures which were commonly used by other composers, remaining polyphonic throughout, in the manner of his motets. His works published between 1549 and 1567, include 41 motets, mostly for five and six voices, and 13 secular works, mostly madrigals, for four and five voices.

Wikisource has an original article from the 1913 Catholic Encyclopedia about:

Gioseffe Zarlino

• Article "Gioseffo Zarlino", in The New Grove Dictionary of Music and Musicians, ed. Stanley Sadie. 20 vol. London, Macmillan Publishers Ltd., 1980. ISBN 1-56159-174-2
• Gustave Reese, Music in the Renaissance. New York, W.W. Norton & Co., 1954. ISBN 0-393-09530-4
• Gioseffo Zarlino, Istituzioni armoniche, tr. Oliver Strunk, in Source Readings in Music History. New York, W.W. Norton & Co., 1950.

• Zarlino was listed in the International Music Score Library Project