An A A' phrase relationship involves repeating a musical phrase with slight variations in the second occurrence. It adds interest and variation while still maintaining some similarity between the two phrases.
Related terms
Sentence Structure: Sentence structure consists of two contrasting phrases, usually labeled as antecedent and consequent.
Period Structure: Period structure consists of two related phrases, labeled as antecedent and consequent, where each has its own distinct melodic material.
Motive Development: Motive development involves taking a short musical idea (motive) and transforming it through various techniques such as repetition, inversion, or augmentation.