Robert Craft, Stravinsky Adviser and Steward, Dies at 92 (nytimes.com)

There's another well-written obituary that's also worth reading here: http://www.telegraph.co.uk/news/obituaries/11997024/Robert-C...

I took a theory class in the music of Stravinsky in grad school, and we used Craft's books at several points. It's interesting to think of the life of a person as having historical significance in large part because they acted as a window into some other person. I suppose it's actually rather common, and there are other examples even in the world of classical music (Schindler comes to mind for Beethoven).