Passage Summary: Researchers found that people who struggle to recognize melodies can't tell different musical notes apart, but they have no trouble keeping a beat or noticing when a rhythm changes.

Reasoning: Individuals with amusia cannot distinguish between pitch changes similar to piano notes, yet they remain capable of identifying rhythmic patterns and timing variations.

Analysis: The stimulus presents a clear contrast between two types of musical processing: pitch and rhythm. Since the subjects fail at one but succeed at the other, it suggests that these functions are neurologically distinct. When looking for the most strongly supported hypothesis, prioritize an answer that suggests the brain processes pitch and timing through different pathways. The data doesn't prove this definitively, but it provides a strong foundation for such a biological claim.