Answer:
During music's Classical Period, which lasted from the mid-18th century to the early 19th century, the symphony became the pre-eminent instrumental genre. The symphony's most direct musical ancestor was the sinfonia, an orchestral overture heard before 17th-century Italian operas.
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Symphony, a lengthy form of musical composition for orchestra, normally consisting of several large sections, or movements, at least one of which usually employs sonata form (also called first-movement form).
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