How does a melodic sequence repeat a phrase at a different pitch level?

In music, a melodic sequence is a technique where a specific melodic figure or phrase is repeated at a new pitch level, a process known as transposition.12

By restating a musical pattern at different pitches—typically two or three times—the sequence preserves the original melodic shape and relative motion of the notes while introducing tonal variety. This method serves as a fundamental tool for musical development, allowing composers to unify and expand upon their material.1

Sequences are generally categorized into two types:
* Nonmodulating (or tonal) sequence: The restatements remain within a single key.1
* Modulating sequence: The restatements traverse multiple keys, which is frequently used to drive harmonic progression in larger works, such as in the development sections of a sonata.1

While highly effective for building musical momentum, the technique is most successful when applied with care, as mechanical or excessive use can lead to predictable results.1