Final answer:
The task of balancing tonal qualities and combining all tracks into a final mix is typically handled by the Music Producer. They work closely with the creative team to ensure the music and sounds fit the concept and atmosphere of the production.
Step-by-step explanation:
The individual who balances tonal qualities, serving as "the magic ear," and pieces together all tracks into a winning mix is known as the Music Producer. This role is crucial in the process of music production as they often select and compose music needed to underscore a scene, provide atmosphere, and work closely with the entire creative team to ensure consistency with the overall design and concept. The history of sound design credits the first recognized professional in the field as Dan Dugan, indicating the significance and evolution of the role over time. Additionally, the Sound Designer plays an imperative role in the theater production by creating accurate and consistent sounds according to the play's needs and making critical decisions on microphone selection.