Final answer:
Sonata allegro form is a dominant style trait in the Classical era, particularly utilized in the first movements of symphonies, string quartets, and piano sonatas.
Explanation:
Sonata allegro form became a dominant compositional style trait in the Classical era. This form, also known as Sonata Form, consists of three sections: exposition, development, and recapitulation. It was commonly used in the first movements of Classical symphonies, string quartets, and piano sonatas.
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