Clavier Directeur Harmonique Yamaha HD-300The Harmony Director HD 300 is one of the specialized educational tools for wind bands. Harmony Director HD 300 can show quickly correct tempo and intonation which is difficult for directors to explain. Through listening sound from HD 300, players can learn their ear and rhythmic sense efficiently. HD 300 will support everybodys performance to learn fundamental musical technics efficiently and to share the pleasure of music. Recording for interactive