symphony

In the early 18th century, the term "symphony" was applied to any instrumental prelude, interlude, or postlude. In modern usage, the term is applied to a large composition for orchestra, generally in three or four movements. The symphony may also be defined as a sonata for orchestra. The earlier symphonies, those of the Classical era, were generally simpler, and of a smaller scale. By the late Romantic era, the symphony had grown in number of movements, length of movements, number of instruments, variety of instruments, and dynamic range.