George Ivanovich Gurdjieff (January 13, 1866 – October 29, 1949), also commonly referred to as Georges Ivanovich Gurdjieff and G. I. Gurdjieff, was an influential spiritual teacher of the early to mid-20th century who taught that most humans live their lives in a state of hypnotic "waking sleep", but that it is possible to transcend to a higher state of consciousness and achieve full human potential. The Gurdjieff music divides into three distinct periods.