My husband and I discuss this now and then (usually over a couple bottles of wine, with old music playing), and his choices have been made: "I've Got a Lovely Bunch of Coconuts", to begin, 'cos that's the sort of fellow he is, and finishing with Al Bowlly doing "Goodnight Sweetheart". I have such a wide, wide range of musical passions that I don't think I could pin down one song. If those putting me in the ground want to sing me away, they're free to choose. As long as it's old and/or obscure. If they play something sappy and modern I may have to pull a ghostly prank.