[skip spence]

^^I can't be bothered to look up any direct quotes right now, maybe later.

In any case, the title "Morgoth's Ring" is derived from the idea that Morgoth has dispersed his powers into the very fabric of earth in similar fashion to how Sauron put forth his much more limited powers into the One ring. This means that every being that draws its physical being or 'hroa' from the fabric of the earth, comes with a piece of Melkorism in it, which is a capacity and often a tendency towards evil (you might also call it a free will). Read the debate of the Valar in MR concerning the unnatural death of Miriel, mother of Feanor, for more info.

Melkor can't control any of the Children of Illuvatar directly, as the 'fea' (sp?) of the Children is indomitable by nature. He can influence and make them fear him however and does it at all times too. Some can resist his bidding better than others but all are affected. Like I said, in the metaphysics of Arda, Melkor is evil, and when ever someone does what is evil and unnatural, he or she obeys the will of Morgoth. And this goes on even after his defeat and banishment. Just like Sauron can't be destroyed completely unless the One ring is destroyed, the marring of Morgoth can't be wholly undone unless Arda itself is destroyed.