The '39 Series'

2-The 39 Series, the set of 39 Movements selected by Gurdjieff out of the multitude of his new exercises given from 1939 until his death in 1949. He recommended these for further practice and he considered them completed. In fact, the prominence of these 39 among his other attempts was so obvious that, when Gurdjieff asked Thomas de Hartmann to compose music for his newer exercises, everybody understood he was talking about these particular Movements. After Gurdjieff's death, Thomas de Hartmann composed the music for this Series; but only for 37 of them because, for two of the 39, the pianist is required to improvise.