The document provides an overview of the symphony, including its history, typical structure, and evolution over time. It begins by explaining that a symphony is a multi-movement musical composition for orchestra, with roots in opera overtures and concerto grosso forms from the early 18th century. It then describes the standard four-movement classical symphony form that emerged by 1770. The document concludes by tracing the symphony genre from Beethoven's revolutionary works through the romantic and modern eras to the symphonies of today.