Witnesses

Arthur Honegger, „Du cinéma sonore à la musique réelle“ (1931), in: Arthur Honegger, Ecrits, ed. H. Calmel, Paris: Honoré Champion 1992, 105-111.
pdf  in French
With the kind permission of Editions Honoré Champion, Paris.

Arthur Honegger and Arthur Hoérée, „Particularités sonores du film RAPT“ (1934), in Arthur Honegger, Ecrits, ed. H. Calmel, Paris: Honoré Champion 1992, 139-144.
pdf in French
With the kind permission of Editions Honoré Champion, Paris.

Robert Blum, „Tonfilmmusik“, in: Nachrichtenblatt der Musikakademie Zürich, 44, März 1954, 1-5.
pdf in German
With the kind permission of the Robert Blum Gesellschaft c/o Lukas Blum, Thalwil.

Bruno Spoerri, Einstieg in die Filmmusik – 1964, Musik und Medien (1983). On: www.computerjazz.ch. Adapted by Bruno Spoerri for swissmusic.net, 2009.
pdf in German
With the kind permission of Bruno Spoerri.