Gurdjieff and Music: The Gurdjieff/De Hartmann Piano Music and Its Esoteric Significance (Aries, 20): Petsche, Johanna: 9789004284425: Amazon.com: Books
HINDEMITH: Ludus Tonalis / K.A. HARTMANN: Piano Sonata '27 April 1945' – First Hand Records – FHR
Two Piano Pieces By Christian Hartmann - Performing Score Sheet Music For Piano Solo - Buy Print Music HH.HH398-SOL | Sheet Music Plus
Emil Hartmann - Wikipedia
Thomas de Hartmann | Spotify
Piano Sayian - HARTMANN German piano | Facebook
Piano droit Hartmann 108 – piano e forte
Gurdjieff / De Hartmann: Complete Music for the Piano - Brilliant Classics
J. P. E. Hartmann: Piano Works, Vol. 3 by Thomas Trondhjem on Apple Music
Albert O.hartmann Piano | My Piano Friends
Piano Sayian - HARTMANN German piano | Facebook
piano-H118C-PE-Hartmann - L'univers de la musique et des instruments
Georges Ivanovich Gurdjieff, Thomas Alexandrovich de Hartmann, Cecil Lytle - The Complete Piano Music of Georges I. Gurdjieff and Thomas de Hartmann (6 CD Boxed Set) - Amazon.com Music
Music for Strings by J.P.E. Hartmann by Various Artists & Emil Telmányi on Apple Music
Bela Hartmann - Pianist: Audio Samples
Johan Peter Emilius Hartm J.P.E. Hartmann: Piano Works - Volum (CD) (UK IMPORT) 5709499950005 | eBay