OJ 9/34, [26] Handwritten letter from Cube to Schenker, dated August 19, 1931

Cube informs Schenker that Moriz Violin's son has been taken ill; Cube sends Schenker a copy of the Schenker Institute prospectus.

OJ 5/7a, [39] (formerly vC 39) Handwritten postcard from Schenker to Cube, undated [August 22, 1931]

Acknowledges OJ 9/34, [26] and asks for further copies of the prospectus of the Schenker Institute, Hamburg.

OJ 9/34, [27] Handwritten letter from Cube to Schenker, dated September 8, 1931

Line drawing of Moriz Violin. Cube reports on health of Violin's son; discusses his relationship with Violin, and the prospects of the Schenker Institute in Hamburg; Cube will be assisting at a lecture given by Hans Weisse.

OJ 9/34, [28] Handwritten letter from Cube to Schenker, dated October 16, 1931

Cube reports enrollment and quality of students at the Schenker Institute, Hamburg; his own teaching is increasingly small-group-tuition based, drawing on Tonwille and Meisterwerk. Karl Violin is recovering.

OJ 9/34, [29] Handwritten letter from Cube to Schenker, dated October 20, 1931

Encloses graph of J. S. Bach, Wohltemperirtes Clavier, Book I, Prelude in C major and asks Schenker's opinion of several aspects of his graphing.

OJ 5/7a, [41] (formerly vC 41) Handwritten postcard from Schenker to Cube, dated January 14, 1932

Schenker acknowledges a [non-extant] letter, and asks for a clipping from the Frankfurter Allgemeine Zeitung.

OJ 9/34, [30] Handwritten letter from Cube to Schenker, dated January 16, 1932

Cube encloses the requested clipping and an explanatory letter.

OJ 9/34, [35] Handwritten letter from Cube to Schenker, dated December 7, 1932

Cube reports on his current state of mind, his work on a Bach graph (commenting on a graph by Angi Elias), promises to send an article on Schenker that has appeared in the Frankfurter Zeitung, on the difficulties of the Schenker-Institut, and on Moriz and Karl Violin.