I think the piano works not because it implies Anakin’s sadness over doing this but rather Obi-Wan’s sadness over not being able/willing to stop it.
^
I prefer Anakin’s Dark Deeds over the piano. The former sounds more personal (it’s names after a character after all), while the piano, though good, sounds more like something you’d play over a montage at the end of a story. The piano also sounds too sad for what Vader is doing, like it pains him to do it, which it doesn’t.
The lightsaber editing is also good, though I’m wonering if you can add bac Vader saying “the year’s have made you weak,” as a way of clarifying when Ben was weak but ready in episode 4 & weaker/unprepared now.
I respect that. I intend and interpret the music as a reflection of Obi-Wan’s feelings in this scene rather than Darth Vader’s, him being the main protagonist and all.
There are many mixed opinions on this matter - as it should be, and although we have not settled on anything as of yet, the most likely outcome will be Dark Deeds or Piano Theme over that scene rather than silence.
Hal 9000 said:
Now, if they go balls to the wall with a hard comment on the discrepancy by having Ben inject memories into her or something like that in a way essential to the story…
Hmm, I could actually see Kenobi doing that.