An orchestra is a large ensemble of musicians that typically includes sections of string instruments, woodwinds, brass, and percussion instruments. The conductor leads the orchestra in rehearsals and performances, and the musicians typically perform music from a wide range of genres and eras, including classical, popular, and contemporary music. The size and composition of an orchestra can vary depending on the type of music being performed and the specific ensemble. The word orchestra comes from the Greek word "orkhestra" which means a place for dancing. In the classical tradition, an orchestra is a group of musicians who play together to make symphonic music.