Gluck's famous forewords to his operas, documents and letters
addressed to Gluck, and such few fragments as have survived of
Marianne Gluck's letters, etc.

In this collection twenty letters and documents appear for the
first time in print. It seems, therefore, unlikely that any further
discoveries of important documents will be made, although there is
always the possibility that letters may still come to light in private
archives. On the other hand, letters addressed to Gluck, except for a
few which happened to survive, went up in flames together with the
remainder of the maestro's papers.

We are particularly grateful for assistance which we received not
only from Professor Dr Hugo Riemann and Director Dr Georg
Kinsky, whom we have already mentioned, but also from all the
archives, libraries and collections which placed their autographs at
our disposal: Louis Koch Collection, Aarau; Karl Geigy-Hagenbach
Collection, Basel; Internationales Musiker-Brief-Archiv, Berlin;
Sächsische Landesbibliothek, Dresden; Instituto Musicale, Florence;
Steiermärkisches Landesarchiv, Graz; Stadtbibliothek, Leipzig;
Musée et Domaine de Mariemont, Belgium; Bayerische Staats-
bibliothek, Munich; BibliothĒque Municipale, Nantes; Walter
Hinrichsen Collection, New York; BibliothĒque du Conservatoire
National, Paris; BibliothĒque Nationale, Paris; Sibley Musical
Society, Eastman School of Music, Rochester, N.Y.; Bibliothèque
François Lang, Royaumont; Memorial Library of Music, University
of Stanford, California; Württembergisches Hauptstaatsarchiv,
Stuttgart; Library of Congress, Washington; Thueringisches Staats-
archiv, Weimar; Geheimes Staatsarchiv, Vienna; Oesterreichische
Nationalbibliothek, Vienna; Stadtbibliothek, Vienna.

The following had valuable suggestions to make, for which we
are also grateful: Miss Emily Anderson, London; Miss Geraldine de
Courcy, New York; Mrs Edna C. Davis, Los Angeles, California;
Madame Yvonne Desportes, Paris; Madame Yvette Fedorov,
Paris; Frau Marie Floersheim-Kocht, Muzzano/ Lugano; Madame H.
Gouin, Paris; Professor Dr Edith Heischkel-Artelt, Frankfart-am-
Main; Frau Archivdirektorin Dr Hedwig Kraus, Vienna; Madame
Elisabeth Lebeau, Paris; Fräulein Marie Lipsius ( La Mara)†, Leipzig;
Mademoiselle Simone Wallon, Paris; Mrs Eduard H. Wannemacker,
New York; Miss Ruth Watanabe, Rochester, N.Y.op; Fräulein
Liesbeth Weinhold, Munich; Professor Dr Hermann Abertt,
Berlin; Professor Reneé Anglade, Institut Franäais, Berlin; Sidney
Beck, New York; Richard Bertlingt, Dresden; President Dr

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