This Day Aria is an extremely creepy song, but Dimondium has found a way to make it sound even more ominous. A simple key change to A major makes the whole thing sound quite a bit darker. It makes for an interesting listen. Check it out here.
You can visit Dimondium's Youtube channel for more neat music.
(By the way, I know we've used this picture a few times already, but it seems fitting to use it again. It seems to perfectly capture the essence of the song!)
(The picture also gives me nightmares.)