Cherkassky, Shura. (1909–1995) & Cherkassky, Lydia. [Lewenthal, Raymond. (1923–1988)] Group of Letters to Raymond LewenthalA remarkable group of 18 autograph and typed letters signed from the American virtuoso pianist Shura Cherkassky and his mother, pianist and teacher Lydia Cherkassky, to fellow pianist Raymond Lewenthal. 12 of the letters and postcards date from 19571958, a period during which Lewenthal was studying with Alfred Cortot in Siena and beginning to perform in London. Cherkassky, as an older and well established pianist, and his mother Lydia, who had been