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 .