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The shift from Baroque to Classical harmony involved the emergence of functional harmony with clear tonic-dominant relationships. Baroque music explored colorful dissonance and rapid harmonic movement, while Classical composers established a more systematic harmonic language emphasizing stability and efficient modulation. This transition enabled new formal structures like the sonata.
Study score excerpts from late Baroque (Bach, Handel) alongside early Classical works (Haydn, Mozart) to hear how harmonic goals and pacing changed. Focus on how composers used dominant-tonic relationships to articulate large-scale form.
The Baroque period was harmonically adventurous in a particular way: composers like Bach moved through complex harmonies rapidly, used chromatic dissonance expressively, and wove multiple independent voices together in dense counterpoint. The basso continuo provided a harmonic skeleton, but the system still retained modal elements and didn't always prioritize strong, predictable dominant-to-tonic arrivals at regular intervals. Listening to a Bach fugue, you feel harmonic motion as continuous and forward-driving, not organized into clearly demarcated sections by harmonic goals.
The Classical period (c. 1750–1820) simplified and systematized this harmonic language. Composers like Haydn and Mozart reduced harmonic pace and clarified the role of the dominant as the primary tension-creating harmony that resolves to the tonic. This is functional harmony at its most systematic: chords have clear functions (tonic, dominant, subdominant), and progressions move logically through these functions toward cadential goals. Crucially, the rate of harmonic change slowed down — each chord gets more time, making each arrival and departure more perceptible.
The key innovation was using harmonic motion to define large-scale structure. In Baroque music, complex polyphony carried formal weight — the architecture was in the counterpoint. In Classical music, the arrival of the dominant at a half cadence, or resolution to the tonic at a perfect authentic cadence, became structural pillars that listeners could hear and anticipate. Sonata form is essentially a harmonic drama: move from tonic to dominant in the exposition, explore distant keys in the development, and return to tonic in the recapitulation. The form is legible because the harmonic plan is legible.
The transition wasn't sudden. The Empfindsamer Stil (sensitive style) of C.P.E. Bach and the galant style of composers like Stamitz represented intermediate steps — simpler textures, clearer phrase structures, stronger cadential articulation — that gradually displaced Baroque complexity. Think of it as a shift in emphasis: from contrapuntal density (many voices moving independently) to harmonic clarity (fewer voices, cleaner chordal progressions, predictable harmonic arrivals). From your study of Baroque and Classical overviews, you can now hear this not as a simplification but as a reorganization — the same basic materials of functional tonality rearranged to serve new formal and expressive priorities.
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