. . "He also made a series of highly acclaimed recordings for Columbia (CBS) and RCA, including concertos by Tchaikovsky, Rachmaninoff, Prokofiev, Brahms, Chopin and Beethoven with the orchestras of New York, Philadelphia, Cleveland, Chicago and Boston, and with such conductors as Leonard Bernstein, Zubin Mehta, Eugene Ormandy and George Szell." . . . . .