This tune is about the Messiah. Check out these Messianic prophecies:
Diseased or suffering servant prophecies: HIV
Isa 53:3 He was despised, and forsaken of men, a man of pains, and acquainted with disease, and as one from whom men hide their face: he was despised, and we esteemed him not.
53:4 Surely our diseases he did bear, and our pains he carried; whereas we did esteem him stricken, smitten of God, and afflicted.
Psalm 41:8
8 An evil disease, say they, cleaveth fast unto him: and now that he lieth he shall rise up no more.
And the references to the battle of Armageddon:
Revelation 19:11
And I saw heaven opened, and behold a white horse; and he that sat upon him was called Faithful and True, and in righteousness he doth judge and make war.