Thomas de Hartmann: A Composer's Life
Thomas de Hartmann - Wikipedia
Thomas de Hartmann on Apple Music
The Thomas de Hartmann Project
Thomas de Hartmann
Gurdjieff / De Hartmann: Complete Music for the Piano - Brilliant Classics
Gurdjieff / De Hartmann: Complete Music for the Piano - YouTube
Thomas de Hartmann (1885-1956) : "Rituals of a Sufi Order" piano (3 extracts) - YouTube
Gurdjieff / De Hartmann - Holy Affirming, Holy Denying, Holy Reconciling - YouTube
On Olga de Hartmann
On Olga de Hartmann
Olga und Thomas de Hartmann: Biografien | Chalice Verlag
Gurdjieff / De Hartmann – The Music Of Gurdjieff / De Hartmann (1985, Vinyl) - Discogs
The Music Of Gurdjieff / De Hartmann | Light In The Attic Records
Gurdjieff's Music for the Movements - Channel Classics Records
Why Has Ukranian Composer Thomas de Hartmann Been So Neglected? : Interlude
Thomas & Olga de Hartmann | Product categories | Bennett Books
Thomas de Hartmann (Composer, Arranger) - Short Biography
Why Has Ukranian Composer Thomas de Hartmann Been So Neglected? : Interlude
Thomas de Hartmann | Spotify
On Thomas de Hartmann
The Music of GURDJIEFF / de HARTMANN Hymns, Prayers and Dances - YouTube
The Gurdjieff Legacy Foundation Archives
