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Harpsichord
Historical Use
The harpsichord was popular in the 16th to 18th centuries, so it often appears in historical or classical music contexts. 
Sound Quality
Unlike a piano, a harpsichord produces a distinctive, metallic sound because its strings are plucked, not hammered. 
Not Volume Adjustable
The harpsichord cannot play dynamics (loud and soft) because the mechanism plucks strings with consistent force. 