Gabrilowitsch, Ossip. (1878-1936) Typed Letter SignedTyped letter signed from the Russian born American pianist, conductor and composer to Frederick H. Comstock of the Oratorio Society of New York, regretting that he is unable to accept a position with the ensemble. May 11, 1912. 1 p. Gabrilowitsch writes: "Dear Sir, Your cable arrived this morning and a few hours later came your letter of April 30th. I immediately cabled you as follows: 'Regret, impossible. Gabrilowitsch.' I am writing now to say that