How do antecedent and consequent phrases create a question-and-answer effect in music?

In music, the question-and-answer effect is created through a period, which is a unit of melodic organization consisting of two balanced, successive phrases.

The first phrase, known as the antecedent, establishes a sense of musical inquiry by concluding with a point of partial completeness. This is often achieved through a half cadence, which ends on a dominant chord, leaving the listener with a feeling of unresolved harmonic tension that implies a continuation is necessary.12

The second phrase, the consequent, acts as the "answer." It is typically the same length as the antecedent and provides a sense of resolution by concluding with a stronger cadence—often an authentic cadence—that brings the musical thought to a state of greater completeness. This periodic structure is most common in homophonic music, such as songs and dances, where regular phrasing makes the relationship between these two units clearly audible.12