Film is related to director in the same way song is related to:-

To determine the correct analogy, we must identify the functional relationship between the entities in the first pair.

Step-by-Step Analysis
Analyze the Primary Pair: "Film is related to director."

The Director is the individual responsible for the overall creative vision, coordination, and production of a film. They are considered the primary creator or the person in charge of bringing the film to life.

Apply to the Second Pair: "Song is related to..."

We need to find the person who is the primary creative force or the person responsible for the musical composition and structure of a song.

A Composer is responsible for writing the musical notes, melody, and structure of the composition, much like a director shapes the structure and vision of a film.