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Cusack, C. 2016. Petsche, Johanna J. M. 2015. Gurdjieff and Music: The Gurdjieff/de Hartmann Piano Music and its Esoteric Significance. Leiden and Boston, MA: Brill. xvi + 279pp. Ebook. US$130. E-ISBN: 9789004284449. Hbk. US$142.00. ISBN-13: 96789004284425. Fieldwork in Religion. 11, 1 (Nov. 2016), 121–122. DOI:https://doi.org/10.1558/firn.32188.