Marco da Gagliano (1582–1643) was an Italian composer of the early Baroque period, primarily known for his contributions to vocal music. His genre primarily encompassed sacred music, madrigals, and operas, reflecting the evolving musical styles of his time. Gagliano was a significant figure in the development of the Italian madrigal and is noted for his expressive use of text-setting and rich harmonies. Among his notable works are the operas "La Dafne" (1608), which is often credited as one of the earliest operas, and "L'Egisto" (1625). His collection of madrigals, "Madrigali a cinque voci" (1610), showcases his mastery of the form and his ability to convey emotion through music. Gagliano's impact on music lies in his role as a bridge between the Renaissance and Baroque styles, influencing subsequent composers with his innovative approach to vocal composition. His work contributed to the establishment of opera as a prominent musical genre, paving the way for future developments in Western classical music. His legacy is evident in the continued appreciation of early Baroque vocal music.