How did the Italian overture help shape the Classical sonata’s movement pattern?

The Italian overture, established by Alessandro Scarlatti in the late 17th century, played a foundational role in shaping the movement pattern of the Classical sonata.12

The Italian overture, or sinfonia avanti l’opera, was structured in three distinct sections following a fast–slow–fast (allegro–adagio–allegro) tempo scheme. This tripartite arrangement provided the direct model for the earliest symphonies and significantly influenced the multi-movement structure of the Classical sonata.132

While the sonata form itself evolved from binary dance structures, the Italian overture's influence helped solidify the standard three-movement scheme common in sonatas for one or two instruments. This pattern—a fast opening movement, a contrasting slow second movement, and a fast finale—became a hallmark of the Classical period, providing a balanced framework for thematic development and tonal contrast.431