A natural burial place for me - one just down the road from us, at Clayton in Sussex, which I and herself have earmarked for when we go. Bamboo or similar degradable box, buried near to a tree, wooden marker only - all of which rots away naturally and gives back to the earth some of what we took from it in being.

As to a song, I think it might have to be a small pipes man playing "The Wild Hills Of Whannies". But I might change my mind in the next 30 years or so...