James Levine, the guiding maestro of the Metropolitan Opera for more than 40 years and one of the world’s most influential and admired conductors until allegations of sexual abuse and harassment ended his career, died on March 9 in Palm Springs, Calif. He was 77. His death was confirmed on Wednesday morning by Dr. Len Horovitz, his physician. He did not specify the cause, and it was unclear why the death had not been announced earlier. Mr. Levine had been living in Palm Springs. After investigating accounts of sexual improprieties by Mr. Levine with younger men stretching over decades, the...