Jazz Theory is a framework that helps musicians understand the structure and elements of jazz music. It includes concepts like harmony, melody, rhythm, and improvisation, which are essential for creating and performing jazz. Musicians learn to analyze chord progressions, scales, and modes to enhance their playing and composition skills. Improvisation is a key aspect of Jazz Theory, allowing musicians to spontaneously create melodies over a given chord progression. This requires a deep understanding of the underlying harmonic structure and the ability to express emotions through music. By mastering these principles, musicians can develop their unique style and contribute to the dynamic nature of jazz.