Giovanni Mazzuoli

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Giovanni Mazzuoli, also Giovanni degli Organi (ca. 1360 - May 14, 1426) was an Italian composer and organist of the medieval era.

Mazzuoli was born in Florence and probably was trained on organ by his father Niccolò, who was organist at the church of Orsanmichele until 1376. Giovanni was given this position in 1379, which he held until 1412; he also held organist positions at S. Felicita (1385-1390) and Florence Cathedral (1390-1426). In his last years at Florence he was assisted at the organ by his son Piero.

Mazzuoli, curiously, is best remembered for the absence, rather than the presence, of his musical compositions. There is a large section of the Squarcialupi Codex, an important source of medieval Italian music, which is marked out under his name, and a portrait of him is presented at its head. However, no music is written in these pages; they are decorated around the edges but left blank otherwise. There are at least ten of his works written on a palimpsest in an Italian manuscript, but the state of the paper leaves them essentially unreadable. About a dozen of his son's works are found in this manuscript as well. Nino Pirrotta attributed two works to Mazzuoli, one of which is a ballata ascribed in a manuscript to "Gian Toscan", and the other a piece in the Roquefort Codex ascribed to "Johannes Florentius".