Hi Dwim! Finally started reading this story and WOW! I'm very excited.
Your characterization is terrific; the characters feel true to the originals. I like how you've treated the friendship of Legolas and Gimli. Not too easy and not too hostile - just wary. Good job showing Boromir's instability, his behavior and his thoughts, the manic highs and lows of his moods.
Wonderful job with how you closely follow canon and yet diverge from it at the same time. Sam's vision in the mirror was a twist on canon full of foreboding. But this last scene - well done! How you change the fate of all with small changes here and there and then suddenly everything's different.
I adore your device with the Silenced Song. The idea that 'the Devil cannot sing' is priceless and you've used it to its greatest potential. You've done a great job of weaving it through the story, and it serves as both foreboding and explanation for where events stray from the well-known path. I find it interesting that certain characters are becoming aware of this twist in fate, that the story unfolding is not as it should be.
I'm thrilled to be reading this and look forward to many, many more chapters. (keep writing!) :-)