Sbb B II 4428 Handwritten letter from Schenker to Busoni, dated January 3, 1899

Schenker asks whether Busoni could play an orchestral concert in February, acknowledging that there might be a conflict with Busoni's current agent.

WSLB 130 Handwritten letter from Schenker to Hertzka (UE), dated August 14, 1912

In the most aggressive letter yet on Hertzka's approach over honoraria and correction costs, Schenker asserts that UE ought to subsidize his works through the takings on the lucrative works of others. UE acquires Schenker's works for a fraction of their true value, yet is held responsible for UE's costs. Schenker refuses to sign the draft contract for his Die letzten fünf Sonaten Beethovens with an implied threat of withdrawal.

OC 52/95-96 Typewritten letter from Hertzka (UE) to Schenker, dated August 22, 1912

Die letzten fünf Sonaten: Hertzka backs down on the contested contract clause; Beethovens neunte Sinfonie: Hertzka refuses to budge on his proposal for the supplementary honorarium, but assures Schenker of his good will toward him.