An album of music written by Gurdjieff and Thomas de Hartmann, produced by RF and played by Sicroff, Journey To Inaccessible Places, was released in 1987 on the EG label. Also worth hearing is Keith Jarrett's recordings of mystic's music on the ECM album, Sacred Hymns.
If you're interested in hearing more about the connections between RF and Gurdjieff's music then you hop over to the excellent John Schaefer's New Sounds programme where you can listen to an entire show.
Finally, there's a rather groovy excursion into archive recordings of old Hurdy-Gurdy himself revving it up at the harmonium on an impressive 3 CD box set and book combo with an introduction by RF.