I've thought about this question more than is healthy, I'm sure. One contender is Libera Me from Faure's Requiem. But I'm currently leaning toward one of Bach's Goldberg Variations. Either the Aria or Var. 13 or perhaps the final variation, no. 30. My wife just loves it when I have some new thoughts on this quesiton.
What music would you like at your funeral?
Assuming that at some point far into the future that you have gone to audiofile heaven, what you you like people to play at your funeral in case you are listening and to help them with their loss?