In 1929, when Thomas de Hartmann and his wife took leave of G. I. Gurdjieff at Gurdjieff's Institute near Paris, they left behind a steamer trunk filled with manuscript music, much of which is recorded here for the first time. The music was composed by Gurdjieff and de Hartmann in a collaboration witnessed daily by the community of Gurdjieff's pupils and documented both in de Hartmann's book Our Life with Mr Gurdjieff and in the well-preserved sequence of manuscript drafts. One thing is clear: an exceptional musical event occurred at the Institute for the Harmonious Development of Man in the years 1925-27, and its enduring result is this body of music.