I've searched for this song everywhere but I can't remember the name of it and its driving me crazy. I'll give as much detail as I can. The song is sung by Hatsune Miku and Kagamine Rin, though Miku sings most of the song. It's also fairly old, I think. I remember listening to it between 2010- 2013? The story of the song revolves around the idea of a bunch of dead/ forgotten creatures/ people marching towards some place at night together. They all meet together in a clearing somewhere to dance their sorrows away under the moon. There is a piper in the song who sits on a high tower, playing his pipe which allows for all these creatures sorrow to drift up to the sky. Miku is marching with everyone because she has been replaced by Rin (this is revealed in the middle of the song). At the end of the song, the piper begins to cry for Miku because he pitied her. When the song ends, Miku claims that she either doesn't feel alone anymore or that everything is alright now and a picture of her full face is shown, half of it decayed/ worn away to show the wires/muscle underneathe. The art is all black and white and the song begins with Miku marching and a steady drum beat like in a march, Miku singing to the beat of it.
If y'all know what song is this, please help me figure this out. I've been searching for months.