Which composer most dramatically transformed the conventions of music in the eighteenth century?

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While Haydn and Mozart were both important and influential composers in the classical period, Beethoven's compositions most dramatically transformed the conventions of music in the late 18th and early 19th centuries. He expanded the scope and emotional depth of music, while also pushing the boundaries of classical forms and developing new ones, such as the symphonic poem. Beethoven's innovative and expressive use of harmony, melody, and rhythm paved the way for the Romantic era that followed.

Which Composer Most Dramatically Transformed the Conventions of Music in the Eighteenth