The orchestra has also hosted many distinguished guest conductors, including Thomas Beecham, Leonard Bernstein, Aaron Copland, Edward Elgar, Morton Gould, Paul Hindemith, Erich Kunzel, Erich Leinsdorf, Charles Munch, Eugene Ormandy, André Previn, Sergei Prokofiev, Sergei Rachmaninoff, Maurice Ravel, Arnold Schoenberg, Leonard Slatkin, Leopold Stokowski, James Levine, Richard Strauss, George Szell, Klaus Tennstedt, Michael Tilson Thomas, Bruno Walter, and John Williams. Many of these guests have also recorded with the orchestra. Carlos Kleiber made his only symphonic guest appearances in America with the CSO in October 1978 and June 1983.