With Koussevitzky , the orchestra gave radio broadcasts and made its summer home at Tanglewood , where Koussevitzky founded the Berkshire Music Center , which is now the Tanglewood Music Center . Under Koussevitzky , the orchestra gave regular radio broadcasts and established its summer home at Tanglewood , where Koussevitzky founded the Berkshire Music Center , which is now the Tanglewood Music Center .