Why did the scherzo replace the minuet in many Beethoven sonatas and symphonies?

The transition from the minuet to the scherzo in the works of Ludwig van Beethoven was driven by a shift in musical character and function. While the minuet was a stately, aristocratic dance, Beethoven—following the lead of Joseph Haydn—increasingly accelerated the tempo of these movements.12

As the tempo increased, the music could no longer function as a dance medium. Instead, it evolved into the scherzo, a swift, light movement characterized by:

• Dynamic and Orchestral Surprise: Unlike the predictable nature of the minuet, the scherzo utilized abrupt rhythmic changes and brilliant orchestration to create unexpected effects.1
• Structural Expansion: While retaining the traditional ternary (ABA) structure—often incorporating a trio—Beethoven sometimes expanded the binary structures of the scherzo and trio into complete sonata-form designs.12

This evolution allowed the movement to move beyond its origins as a simple dance-style piece and integrate more fully into the dramatic, developmental principles that defined the Classical sonata style.2