Marsilio Casentini (also known as Marsilio Cattaneo) was an Italian composer and musician active during the late Renaissance and early Baroque periods, with his life spanning approximately from 1580 to 1650. Primarily known for his contributions to the genre of sacred music, Casentini's work is emblematic of the transition from Renaissance polyphony to the more expressive styles of the early Baroque. Notable works include his collections of motets and sacred music, which showcase intricate vocal harmonies and a clear textural clarity. His collections often featured both liturgical and devotional themes, reflecting the religious fervor of the time. Casentini's impact on music can be observed in his role in the development of the Italian vocal tradition, influencing composers who followed by emphasizing emotional expression and the use of dissonance for dramatic effect. His works were widely performed in ecclesiastical settings, and they contributed to the evolving practices of choral music during a pivotal period in Western music history. Although not as widely recognized today, Casentini's contributions form an important part of the tapestry of early Baroque music.