After piling up billions in business, he pledged to donate almost all of his money to causes before he died. He succeeded, and then lived a more modest life.
He was known as a passionate, idiosyncratic performer in concerts and on recordings and admired as a longtime teacher at the New England Conservatory of Music.
Writing for The Times with a gimlet eye, she examined the impact of no-fault divorces on women, the excesses of the Reagan years, the AIDS crisis, and more.