Abstract: A rotating object, such as a toy top or yo-yo, is provided with a display mechanism which permits the display of letters, number and graphics as the object moves. In one embodiment a toy top is taught which incorporates such a display made up of string of light emitting diodes. As the top is spun a switch is closed by centrifugal force which activates the display circuitry. A message previously stored in the display circuitry memory is then read out of memory and is used to control the illumination of the LED's. As the top reaches a revolutionary speed which is in synchronization with the clocking speed of the display, the message is viewable by the user, and remains viewable until the rotational speed of the top slows enough to defeat the visual synchronization.

Abstract: An electronic instrument and method includes manual control switches for producing and controlling creative variations on pre-recorded song selections that remain synchronized and melodiously oriented to the selected song substantially independent of the timing of manual operation of control switches. Several instruments of similar design can be connected together to facilitate `playing in a band` of such instruments which synchronize on the song selected via one instrument and which respond to individual solos or riffs `played` on one instrument with corresponding, timed solo or riff capabilities on other instruments.