I was about to say - he performed the Gurdjieff/De Hartmann piano works. Nice stuff but for Gurdjieff pieces i suggest Vassilis Tsabropoulos's "Chants, Hymns and Dances" on ECM. Amazing, incredible stuff... For even more authenticity, Harmonic Development, Gurdjieff's eery Harmonium recordings from the 40s just before his death. Talk about drearily deep compassion for the suffering of the world.