Abstract: A music crystal ball structure capable of rotating in alternating directions. A music bell serves as a power source for transmitting power to a mutilated gear which further transmitting the power to a gear member having inner circumferential teeth and outer circumferential teeth. The gear member is driven to rotate in alternating directions. For example, the gear member is counterclockwise rotated through an angle and then clockwise rotated through another angle. Such movement is circularly repeated to form a "forward 3, backward 1" state. By means of more than one set of gears, the decorative articles installed in the crystal ball and driven by the gear member can act like dancing opposite to each other and create a dynamic live view.