Final answer:
In a musical, focusing on one big thing helps to move the character forward and ensures that the song serves a purpose in the story.
Step-by-step explanation:
In musicals, it is sometimes better to focus on one big thing because it helps to move the character forward and avoids interrupting the flow of the story. When a song is included just for the sake of having a song, it can disrupt the action and create a jarring effect. By focusing on one big thing, the audience can better understand the purpose and importance of the song within the context of the musical.