Abstract: A rhythm controller for producing a selected number of clock pulses for a musical beat interval comprising an oscillator, first and second counters coupled to the oscillator and a divider coupling the first counter to the oscillator to reduce the output frequency of the oscillator to the first counter. Input means generates a pulse at the onset of each beat interval and enables the first counter to count the divided output of the oscillator for a first beat interval. A comparator receives the count of the first counter, compares the count for the first beat interval with the count of the second counter and produces a clock pulse upon a coincidence. The clock pulse resets the second counter which continues to recount and to be reset after each coincidence until the end of a beat interval, thereby causing a selected number of clock pulses, i.e., a timebase, to be produced for the first beat interval.