Bobby Hutcherson, one of the most admired and accomplished vibraphonists in jazz, died on Monday at his home in Montara, Calif. He was 75. Marshall Lamm, a spokesman for Mr. Hutcherson’s family, confirmed the death, saying Mr. Hutcherson had long been treated for emphysema. Mr. Hutcherson’s career took flight in the early 1960s, as jazz was slipping free of the complex harmonic and rhythmic designs of bebop. He was fluent in that language, but he was also one of the first to adapt his instrument to a freer postbop language, often playing chords with a pair of mallets in each...