OJ 9/34, [8] Handwritten letter from Cube to Schenker, dated May 28, 1927

Cube reports on the state teaching examination, on which he was graded "satisfactory," deploring the way it was conducted.

OJ 9/34, [10] Handwritten letter from Cube to Schenker, dated January 30, 1928

Cube reports progress in his class and private teaching, performance of his compositions, his forthcoming lecture; outlines plan for an exhibition in Duisburg to celebrate Schenker's 60th birthday; has heard nothing of Hoboken's "Aufruf."

OJ 9/34, [21] Handwritten letter from Cube to Schenker, dated June 25, 1930

Acknowledges OJ 5/7a, [29] and offers mitigation for Vrieslander's non-acquaintance with the Urlinie (to which Cube has just introduced new violin teachers). Reports on Erich Voß, and on concert plans at Conservatory. Reports on his teaching. Threat of financial difficulties; he has offered his services to the Hochschule für Musik in Berlin.