OJ 9/27, [2] Handwritten letter from Busoni to Schenker, undated [c. May 20, 1897]

Busoni acknowledges receipt of a packet of Schenker's compositions. He suggests that Schenker might combine three of the piano pieces into a single three-section work. He will not now be able to visit Mannheim, where the two men were planning to meet.

OJ 5/19, 6 Handwritten letter from Schenker to Max Kalbeck, undated [c. January 20, 1898]

Schenker writes of impending performances of his piano music by Eugen d'Albert and Ferruccio Busoni, and of the latter's enthusiasm.

Diary entry by Schenker for 21 November 1906