OJ 9/34, [15] Handwritten letter from Cube to Schenker, dated November 7, 1928

Cube reports his activities in Cologne, especially his work with Heinrich Lemacher, who is a "connoisseur of the Urlinie"; reports on his compositions. Will visit Hupka and Albersheim next time.

OJ 5/7a, [21] (formerly vC 21) Handwritten letter from Schenker to Cube, dated November 20, 1928

Sends best wishes for Cologne lecture-series; is planning to issue a folder of Urlinien for use by teachers, and may deposit his handwritten Urlinien in the Photogrammarchiv, which will be officially opened on November [25]. The "counter-examples" should be taken slowly.

OJ 9/34, [16] Handwritten letter from Cube to Schenker, dated March 26, 1929

Cube is listening by radio to music being performed in Vienna. The two caricatures are his fellow composition teachers at Duisburg. Reports on his work at Cologne Conservatory: success with previous lectures, and forthcoming lecture series.

OJ 9/34, [23] Handwritten letter from Cube to Schenker, dated February 10, 1931

Cube acknowledges issue of Der Kunstwart; encloses a letter from Walter Braunfels responding to his plans to establish a Rhineland base for Schenkerian teaching at the Cologne Hochschule für Musik; wonders whether Anthony van Hoboken might be approached for financial assistance on this, and if so how the approach should be made.