Bar codes representing rhythm data corresponding to rhythm pattern, rhythm progression or a certain kind of rhythm are printed in relation to a musical score, and are read out by scanning with a bar code reader. The rhythm data thus read out are stored in RAMs under the control of a CPU. The rhythm data...http://www.google.co.uk/patents/US4464966?utm_source=gb-gplus-sharePatent US4464966 - Rhythm data setting system for an electronic musical instrument
