Triple(3) Reed Harmoniums:

As its name suggests a triple reed harmonium has 3 lines of reeds. Because of these 3 reeds, it creates 3 notes of sound at once resulting in a mesmerizing sound quality! In a triple reed harmonium, you can find a coupler, a mechanical device to link the two sets of keys together. Without any additional effort from the player, this coupler allows a musician/singer to produce two notes by a single key press. Hence, you can create a layered and complex sound with your triple reed harmonium.