Some say that the origin of the scale of four notes or five notes lies in the natural instinct that man shows in his discovery of instruments. The first instrument was the flute, symbolical of the human voice. It seems natural that man took a piece of reed from the forest and made in the heart of that reed four holes in places where he could easily put the tips of his fingers - the distances of the holes corresponding to the distances between the finger tips - and then one hole below. That made the Raga of five notes.