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WSLB-Hds 94478 Handwritten letter from Schenker to Seligmann, undated [shortly before May 31,
        1911]
Schenker reports the completion of work on Beethoven’s Ninth Symphony and
        enlists Seligmann’s help in placing notices in Viennese newspapers advertising a planned
        series of lectures on modern music (cacophony).
 
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OJ 11/22, [2] Typewritten letter from the Gesellschaft der Musikfreunde (Marchet, Krause) to
    Schenker, dated June 21, 1912
The writers announce plans to institute a regular program of lectures under the
    auspices of the Gesellschaft der Musikfreunde, and invite Schenker to participate by offering a
    lecture or lecture series.
 
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OJ 15/16, [42] Handwritten letter from Weisse to Schenker, dated July 11, 1920
Weisse wishes Schenker an enjoyable summer holiday, and looks forward to visiting
    him. He inquires about the possibility of moving into Reisnerstraße 38, in the event that the
    Schenkers move elsewhere, and informs his teacher about the organization of a lecture series at
    the Vienna Urania. He concludes with some remarks about literary works, Wedekind's Schloß
    Wetterstein and Jean Paul's Levana. 
 
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OJ 10/3, [61] Typewritten postcard from Deutsch to Schenker, dated May 9, 1927
Deutsch asks Schenker to lend him the April 1927 issue of Der Schriftsteller.
        He is grateful for having been introduced to the artist Viktor Hammer. He recommends that
        Schenker visit the Beethoven exposition in the City Hall, and also the Planetarium, where an
        “optical organ” is on display.
 
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OJ 10/3, [75] Typewritten letter from Deutsch to Schenker, dated December 2, 1927
Deutsch encloses Schenker’s score of the “Unfinished” Symphony that was used
        used for the new edition and Alfred Kalmus’s apologetic letter. He mentions the pianist
        Heinz Jolles’ interest in Schenker’s editorial work, in the hope that Schenker might at some
        point tackle Beethoven’s “Diabelli” Variations.