OJ 12/59, [2] Handwritten letter from Siegfried Fritz Müller to Schenker, dated July 12, 1923

Siegfried Fritz Müller asks for a testimonial for a piano teaching position.

OJ 12/58, [1] Handwritten letter from Paul Müller to Schenker, dated July 19, 1923

Paul Müller asks Schenker to write a testimonial for his son, Siegfried Fritz, and expresses satisfaction at the latter's progress.

OJ 12/58, [2] Handwritten letter from Paul Müller to Schenker, dated July 20, 1923

Paul Müller thanks Schenker for a testimonial for his son, Siegfried Fritz.

OJ 12/59, [4] Handwritten letter from Siegfried Fritz Müller to Schenker, dated November 13, 1923

Siegfried Fritz Müller has a teaching job and reports how it is going. -- He is studying Schenker's writings. -- He gives an unfavorable reaction to Walter Dahm's book [Die Offenbarung der Musik: Eine Apotheose Friedrich Nietzsches]. -- He reports Carl Bamberger's trip to Finland.

OJ 12/59, [5] Handwritten letter from Siegfried Fritz Müller to Schenker, dated September 21, 1924

Siegfried Fritz Müller has met with resistence in rural Switzerland to Schenker's ideas. -- He describes his daily working practices. -- He plans to return to Schenker for lessons in Spring 1925 and lists the works in his prepared programs.

OC 52/639 Handwritten letter from Siegfried Fritz Müller to Schenker, dated February 13, 1925

Siegfried Fritz Müller reports his subscriptions to Tonwille and asks for clarity regarding dealings with Drei Masken-Verlag.

OJ 6/7, [20] Handwritten letter from Schenker to Moriz Violin, dated May 4, 1925

In a wide-ranging letter, Schenker sends Violin money for arranging the order of Der Tonwille (which must consist of multiple copies of Tonwille 1); Hertzka's representative, Robert Scheu, is currently studying the papers relating to Schenker's threat of legal action. Schenker continues to express his astonishment at Furtwängler's ignorance of sonata form, a fact that does not prevent him from earning huge fees for conducting in New York. He has turned down a request from a lady who teaches in New York and a former pupil (now in St. Gallen), who wish to spend some time with him in Galtür. He enquires about the personal difficulties that Violin writes about in his letter, and asks him to say more; they will invite his sister for a visit. He will send him a copy of the medallion (designed by Alfred Rothberger); the portrait by Viktor Hammer is not yet finished.

Diary entry by Schenker for 9 August 1924

Diary entry by Schenker for 5 April 1925

Diary entry by Schenker for 6 September 1934