Answer: vibraphones

AnswerCrossword Clue
vibraphonesA musical percussion instrument with a double row of tuned metal bars, each above a tubular resonator containing a motor-driven rotating vane, giving a vibrato effect
vibraphonesVIBRAPHONE, an instrument having metal bars under which are electrically-operated resonators, played by striking the bars with small hammers also VIBRAHARP