Final answer:
A piece in the sonata cycle is a self-contained musical composition that is part of a larger work. Each piece contributes to the overall structure and narrative of the cycle.
Step-by-step explanation:
In the sonata cycle, a piece refers to a self-contained musical composition. It is a single movement that is part of a larger work, such as a sonata or symphony. A piece can have its own distinct musical themes and structure, while also contributing to the overall structure and narrative of the entire cycle.
For example, in Beethoven's Sonata in C major, Op. 53, the first movement is a piece that stands on its own and is often performed independently.
Within the sonata cycle, each piece can have different characteristics and purposes, such as introducing new thematic material, providing contrast, or developing earlier themes.