A symphony is a musical composition, often extended and usually for orchestra. "Symphony" does not imply a specific form. Many symphonies are tonal works in four movements with the first in sonata form, and this is often described by music theorists as the structure of a "classical" symphony, although even some symphonies by the acknowledged classical masters of the form, Joseph Haydn, Wolfgang Amadeus Mozart and Ludwig van Beethoven, do not conform to this model.
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