Giovanni Martino Cesare (c.1590 – 6 February 1667) was a composer and cornetto player.
Cesare was born at Udine. By 1611 (his first publication) he resided as cornetto player at the house of Margrave of Burgau at Günzburg, near Augsburg. In 1615 he became an employee of Duke Maximilian of Bavaria (Munich) as a cornettist, where he wrote his best known collection Musicali melodie (1621). It contains 14 instrumental canzonas of one to six parts with continuo, and 14 motets. He died in Munich.
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