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found: Glass, P. Akhnaten [SR] p1987: insert, p. 3 (Helmut Holzapfel, tenor)
notfound: Kutsch, K.J. Grosses Sänger lexikon;Jacobs, A. Penguin dict. of musical performers;Int'l WW in music, 7th-11th ed.;Baker's, 7th ed.