Yamaha YC61 61-Key Organ Focused Stage KeyboardYamaha YC61 61 Key Organ Focused Stage Keyboard The authentic Waterfall keyboard action of the YC61 was created by painstaking research into traditional organ keyboards and constant feedback from top keyboard artists. The result is a keyboard that not only provides the distinctive touch of an organ, it gives artists new ways to express themselves on acoustic and electric pianos, synth leads, brass sections and more.