Italian musicologist, last of a distinguished line of Renaissance writers on music.

Zacconi became a priest, later an Augustinian, and studied music with Andrea Gabrieli in Venice, where he was musical director for his order. He went to Vienna in 1585 at the invitation of the archduke Charles. In 1592 he published the first part of his Prattica di musica, dedicated to William V, duke of Bavaria, whose service he had entered three years earlier. In 1596 he returned to Italy and in 1622 published the second part of his treatise in Venice.

Zacconi's lucidly written work is an authoritative and encyclopaedic summary of the theory and practice of Renaissance music. His handling of theoretical matters is illuminated by the practical nature of the book. His descriptions of contemporary instruments, their construction, compass, and use, and his discussion of improvised ornamentation are particularly valuable to the modern scholar and performer. Zacconi's compositions include a set of ricercari (fugal pieces) for organ and four books of canons. His autobiography (1626), in which he describes himself as a musician, painter, and poet, is in the Liceo Musicale, Bologna.