Outstanding
I've always loved your music, but this one makes my jaw drop. The vocals are perfect, the instrumentation gives just the right depressing/ominous feeling. I've been poking around for music for a series I'm going to be posting on Newgrounds, and while this song might not be it (although a small part of it might work well), I still downloaded it.
The only flaws, really, were that some of the instruments seemed a bit too abrupt, especially the loud strings that started coming in at 0:25. Those especially seemed out of place (maybe they needed more reverb or something, but they were definitely a bit too loud).
That said, though, still an excellent piece of work, and at least parts of it will likely end up in the series.