Yamaha HD-300 Harmony Director

The Harmony Director HD-300 combines the HD-200's powerful ear training with dynamic new educational features and a simplified user interface. The addition of a mobile app that can act as a stand-alone tuner as well as a hardware controller makes the new HD-300 a complete package that can not only make a teacher's job easier but also help their students play “in tune, in tone, in time and at the correct volume”