[Ibrîniðilpathânezel]

I wonder: Melkor chose to Sing in discord, but musically speaking, those notes that are not within the chord -- discordant or enharmonic -- are nonetheless a part of the music as a whole. That Melkor caused dissonance may have been "wrong" not because of the dissonance itself, but because he wanted it to dominate. Not unlike someone in an orchestra deliberately playing out of key, trying to force the entire ensemble to play not in the given key, but in one s/he prefers.

So, is the fact that Melkor sang discord "evil," or was the fact that he was given free will "evil"? Without free will, he could not have done anything but follow the commands of the Conductor -- which might have led to a kind of perfection, but would not have allowed to any sort of improvisation or even expressive interpretation within the Music. It may be a moot point, since (one presumes) all that exists within Creation exists with the knowledge (or at least the sufferance) of the Creator, and in the end, whatever it truly is "evil will be good to have been, and yet remain evil."