An orchestra is an instrumental ensemble, usually fairly large with string, brass, woodwind sections, and almost always a percussion section as well. It can also be applied to a big band jazz ensemble. The term orchestra derives from the Greek ορχήστρα, the name for the area in front of an ancient Greek stage reserved for the Greek chorus. The orchestra grew by accretion throughout the eighteenth and nineteenth centuries, but changed very little in composition during the course of the twentieth century. Read more on Last.fm.