Original: In 1951, Leonard Bernstein conducted the world premiere of Ives's Second Symphony in a broadcast concert by the New York Philharmonic; the Iveses heard the performance on their cook's radio and were amazed at the audience's warm reception to the music.
Simplified: In 1951, Leonard Bernstein conducted the first performance of Ives' Second Symphony in a broadcast concert by the New York Philharmonic Orchestra.