Tā tiānshēng yuègǎn hǎo, xué shénme yuèqì dōu kuài.
She has a natural sense of musicality and picks up any instrument quickly.
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乐感 encompasses a broad musical intuition - rhythm, pitch, phrasing, and emotional responsiveness to music. It is often described as innate (天生乐感好 = born with good musicality). Compare with 节奏感 (sense of rhythm) which is more specific.