You buy castanets from a supplier of musical instruments.
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While this question makes no grammatical sense whatsoever, yes,
castanets are percussive instruments.
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castanets castanets
i would say acoustic guitar and trumpet
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Yes, Lucero Tena plays the castanets. In Spanish, "castañuelas".
Check her out on YouTube. She plays the castanets for flamenco as
well as classical music. She is fantastic!