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How did Johann Sebastian Bach’s Sinfonias anticipate sonata form?

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symphony performing a concert — symphony Symphony performing a concert at Svetlanov Hall, Moscow International House of Music.

Johann Sebastian Bach’s Sinfonias (specifically his Three-Part Inventions) anticipated the sonata form of the Classical period through their use of thematic development and harmonic structure.1

In works such as Sinfonia VII in E Minor and Sinfonia XI in G Minor, Bach utilized a structural approach that prefigured the Classical sonata:1

Exposition: The pieces present an initial thematic unit that moves from the home key to a different key.1
Development: An intermediate section explores remote keys while transforming the initial motivic material through contrapuntal and harmonic means.1
Recapitulation: The works conclude with a return to the opening material, where the energy generated during the development is dissipated.1

While these pieces rely on contrapuntal processes rather than the dramatic thematic and tonal dualism that defines the later Classical sonata, they demonstrate a sophisticated use of tonality to articulate musical structure. By organizing music through harmonic tension and resolution, Bach established the foundational principles of key contrast and thematic transformation that would eventually evolve into the sonata form used by later symphonists.21