How did the change from counterpoint to melody with harmony affect early symphonies?

The transition from the complex, polyphonic textures of the Baroque era to the simpler, melody-dominated homophony of the early Classical period was a defining shift for the symphony. This change fundamentally altered how symphonies were structured and perceived.12

Impact on Symphonic Structure

• Shift to Homophony: Early Classical composers largely abandoned the dense, equal-voiced counterpoint of the past in favor of a clear, treble-dominated melody supported by chordal accompaniment. This texture allowed for more symmetrical phrase lengths and clearer cadences, which were essential for marking the sections of the emerging sonata form.12
• Harmonic Focus: As counterpoint receded, harmony became the primary generative force in music. Composers began to use key contrast—the dramatic apposition of the tonic and dominant keys—as the fundamental structural principle of the symphony.13
• Developmental Techniques: With the move away from continuous polyphonic imitation, composers focused on motivic development. They treated melodies as raw material to be fragmented, recombined, and reharmonized, particularly within the development section of the sonata form.4

While early symphonists often eschewed counterpoint, the later Classical period saw a sophisticated reintegration of contrapuntal principles, where independent melodic lines were used to enrich the underlying harmonic design.2