The element of improvisation changes the form with each performance in many world styles. The idea of repetition and development seems to be consistent in almost all styles. Timbres used are often drawn from the instruments available. Polyphony is unique to western music. Dynamics - exists in all styles.
Improvisation is an important element of most world styles.
It used to be more important in formal western music than it is today. Distinguish between functional and non-functional harmony. 1. Adds direction to a melody 2. Defines cadences and punctuates music. Is built on tension - release.