It is however regarded as pitched percussion in organology. According to Reis Flora, this is similar to the Western theory of organology. He was one of the founders of modern organology (the study of musical instruments). Organology (the study of instruments) was aided greatly by the development of book printing. Some intellectuals accepted organology while questioning cranioscopy. For much of the 18th and 19th centuries, little work was done on organology. The academic study of musical instruments is called organology.