Claudio Monteverdi (1567-1643) was an Italian composer, singer, and instrumentalist, known for his significant contributions to the development of opera. He is often regarded as a pioneer of the Baroque style, bridging the Renaissance and Baroque periods in music. His most famous works include the operas L'Orfeo and L'incoronazione di Poppea, which showcase his innovative use of harmony and expressive melodies. Monteverdi's music emphasized emotional expression and dramatic storytelling, setting the stage for future composers. He also composed sacred music, including the Vespers of 1610, which highlights his versatility and mastery of different musical forms. His influence on Western music remains profound and enduring.