How do performers re-create music in traditions based on improvised frameworks?

In traditions based on improvised frameworks, performers re-create music by operating within established stylistic norms or structural models rather than following a fixed, prescriptive text. This process involves the spontaneous unfolding of musical ideas, often guided by the performer's deep understanding of the tradition's specific vocabulary, such as melodic themes, rhythmic patterns, or harmonic outlines.12

Performers act as both interpreters and creators, renewing and transforming the music through personal performance. Depending on the tradition, this may involve:2

• Ornamentation and Variation: In many monophonic or modal traditions, such as those involving Indian raga or Islamic maqām, performers elaborate on a core melody or mode. Similarly, in Western historical contexts, performers often added ornamental variants to vocal or instrumental parts.1
• Structural Models: In jazz, improvisation is typically structured around a model, such as a well-known tune or a ground bass, providing a framework for the performer's creative choices.1
• Indeterminacy: In some avant-garde practices, such as those explored by John Cage, performers may be given verbal instructions or graphic codes that require them to make spontaneous decisions regarding duration, instrumentation, or the combination of musical "building blocks," effectively collaborating with the composer to realize the work.13