A symphony orchestra is a large instrumental ensemble which is basically made up of four groups of instruments: stringed, woodwind, brass and percussion.
There are three reasons a guitar is not in an orchestra: (1) The guitar is a very soft-sounding instrument. It would take quite a number of guitars (at least five) to compete with the volume produced...
A symphony is a piece of music written for performance by a symphony orchestra. The composition is usually long in duration compared to other musical forms, and is typically divided into movements...