Stefano Landi (1586–1639) was an Italian composer and a significant figure in early Baroque music. He is primarily known for his contributions to the genre of opera and sacred music. Landi's work is characterized by its expressive melodies and innovative use of instrumentation, which helped lay the groundwork for the development of the operatic form. One of his most notable works is the opera "Il Sant'Alessio," composed in 1632, which is considered one of the earliest examples of the genre. It showcases Landi's ability to blend dramatic narrative with musical expression, featuring complex characterizations and a rich orchestration. Additionally, his motets and other sacred works, such as "Lamentations of Jeremiah," reflect the emotional depth and stylistic evolution of the time. Landi's impact on music is significant as he contributed to the transition from Renaissance polyphony to the more homophonic textures of the Baroque era. His innovative approach to drama in music influenced subsequent composers and the development of opera as a major art form. His work remains a crucial part of the study of early 17th-century music and its evolution.