The orchestra has also had many famous guest conductors , including Richard Strauss , John Williams , Arnold Schoenberg , Sergei Prokofiev , Sergei Rachmaninov , Maurice Ravel , Edward Elgar , Aaron Copland , Leonard Slatkin , AndrÃ Previn , Michael Tilson Thomas , Leonard Bernstein , Leopold Stokowski , Erich Leinsdorf , Eugene Ormandy , George Szell and Charles MÃ 1\/4 nch . The Orchestra has also had many distinguished guest conductors , including Richard Strauss , John Williams , Arnold Schoenberg , Sergei Prokofiev , Sergei Rachmaninov , Maurice Ravel , Edward Elgar , Aaron Copland , Leonard Slatkin , AndrÃ Previn , Michael Tilson Thomas , Leonard Bernstein , Leopold Stokowski , Erich Kunzel , Morton Gould , Erich Leinsdorf , Walter Hendl , Eugene Ormandy , George Szell and Charles MÃ 1\/4 nch .