After a lot of search (ie. 2 hours less sleep and 3 hours no work in the office), I found following comment: "在眾多論壇流傳的所謂杜普蕾大提琴曲《纏綿往事, 其實是《神秘園》第五輯《Earthsongs》第9軌的小提琴曲 "Silence Speaks".
I think that comment is right, you can find it by searching with "Secret Garden"+"Silence Speaks".
Again, thank you for sharing, and I still think it's beautiful.
