The Italian overture is a piece of orchestral music which opened several operas, oratorios and other large-scale works in the late 17th and early 18th centuries. An Italian overture typically has a three-movement structure – the outer movements are quick, the middle movement is slow. This type of overture was particularly popular among Italian composers such as Alessandro Scarlatti, and in the early 18th century would usually be called sinfonia. Later, to avoid confusion with other types of sinfonia/symphony, the term Italian overture was used more frequently.