Cavalli introduced melodious arias into his music and popular types into his libretti. His operas have a remarkably strong sense of dramatic effect as well as a great musical facility, and a grotesque humour which was characteristic of Italian opera down to the death of Alessandro Scarlatti. Cavalli's operas provide the only example of a continuous musical development of a single composer in a single genre from the early to the late 17th century in Venice — only a few operas by others (e.g., Monteverdi and Antonio Cesti) survive. The development is particularly interesting to scholars because opera was still quite a new medium when Cavalli began working, and had matured into a popular public spectacle by the end of his career.