A tuning fork is a tool for tuning musical instruments. It was invented by a trumpet player named John Shore (1662-1751). The tuning fork is composed of a handle attached to the center of a U-shaped steel rod. By striking the rod, sound is created, and the frequency of the resulting vibrations per second is used as a standard for tuning a musical instrument. The three tuning forks of the Yamaha Logo represent the cooperative relationship that links the three pillars of our business -- technology, production, and sales. They also evoke the robust vitality that has forged our reputation for sound and music the world over, a territory signified by the enclosing circle. The mark also symbolizes the three essential musical elements: melody, harmony, and rhythm.