Abstract: A metronome that marks musical time by displaying a clock face having a measure of music depicted about the periphery includes a rotating indicator that sweeps about the clock face to indicate the rhythm. In one aspect, a computer program generates a screen display having a clock face and a clock hand mounted in the center to rotate continuously in typical clock fashion. Using drag-and-drop techniques, notes and other rhythm symbols are placed on the clock face. As the clock hand rotates past each of the indicia, an audible sound is generated to denote that particular aspect of the rhythm in real time. In addition, a display of one or more regular polygons may be presented to indicate counting in a number equal to the number of sides of the polygon. Polygons may be overlaid to display and sound polymetric rhythms, each vertex corresponding to a counted beat.