Answer:
OA. swing
Step-by-step explanation:
The correct answer is OA. swing.
Swing is a mainstream jazz form that heavily relies on arrangement. Swing music emerged in the 1930s and 1940s and was characterized by a strong rhythmic feel, syncopation, and improvisation. However, what sets swing apart is its emphasis on arranged compositions. Arrangements in swing music involve carefully crafted melodies, harmonies, and orchestrated sections for different instruments, creating a cohesive and well-structured sound.
In swing, the arrangements provide a framework for the musicians to play within, often featuring sections for solos and improvisation. This allows for a balance between individual expression and the unified sound of the band. The arrangements in swing music are typically written down and rehearsed, ensuring that the ensemble performs in a coordinated and cohesive manner.
So, swing is the mainstream jazz form that relied heavily on arrangement.