Less than two months before he died, Bernstein, a highly regarded American composer and conductor, conducted what would be his final concert. He had suffered from smoking-related lung problems for years, and his coughing fit partway through the Boston Symphony appearance that night nearly ended the performance. With his health declining, he officially retired in early October, and he died just five days later. What feat in 1943 made him an overnight sensation and set his career in motion? Discuss
Source: The Free Dictionary