Final answer:
Chorus sounds should be integrated into the action of a drama and contribute to the narrative, as exemplified by Sophocles, rather than being unrelated musical interludes.
Step-by-step explanation:
Chorus sounds should often be treated as a distinct element in a drama, making them important to the structure and flow of the piece. According to the given text, the Chorus should act as one of the actors and be an integral part of the action, similar to the role it plays in Sophocles' works, not as an unrelated interlude as seen in works of later poets.
The role of the Chorus has evolved over time, from being central to the narrative and interacting with the main characters, to sometimes simply providing background sound or music. The chorus sounds, including songs and rhythmic verses, should harmonize with the subject matter and contribute meaningfully to the overall story.