Not every song is pleasing to the ear.
Some realities differ widely. In one, Lucifer killed Michael at the Rebellion, and the Symphony has started to fall apart at the seams. In another, Lilith has taken over as Queen of Hell, and Heaven fears for what direction she may take the War in. In yet another, Armageddon has come and gone, nearly all the Superiors have died, and Kobal now commands the bitter remnants of Hell's forces.
You've noticed, haven't you? The similarities. Michael, the Firstborn, be he Seraph, Elohite or Grigori, is always the hero, fighting his rebellious brother Lucifer, Archangel of Light. Were you a experienced traveler of Symphonies though, you might find the one world that contradicts these "canon" realities, a world that turns everything upside down. Where everything is... inversed.
Where Michael, the Firstborn, grew jealous of the attention God gave to mankind, and was discontent with how the noble angels of Heaven seemed second to the dirty corporeal constructs. Where Lucifer did follow his brother, but overcame his selfish desires at the last moment, and saved Heaven from total dissolution. Where half of the Heavenly Host died in Michael's Rebellion. Where Malakim, proud and strong, found even their pure natures twisted into something dark and selfish. Where Lilith, the Prime Woman, broke Hell free of its bondage, but was nearly killed by Michael for her efforts. Where demons look longingly to the sky, and the shadow of Hell's King casts itself over even the brightest of souls.
Not to say that the people of this reality are doomed. No, there is yet some hope, for all of Michael's Godlike power. The world is benighted, but wandering through the darkness, you will find points of light, bright and beautiful, bastions of all that is truly good in mankind.
Still, Michael's promise to destroy God and make the Symphony his own rings loudly in the Hearts of all celestials... and despite how hard the Host tries, a unified and powerful Horde presses ever onwards to what seems like inevitable victory.
Are the angel's of this world doomed, to be crushed under the boot of a Dark God? Maybe. Is their struggle to save mankind, who the Host believes to be inherently good, from being the slaves of the Firstborn, all for nothing? Perhaps. Or will they win in the end, will God watch on as the Host and mankind destroy the Darkness, and end the tyranny of the Serpent?
If you would ask Yves that final question, he would only smile.