Tolkien's verses that describe the Duel of Song in the Lay of Leithian are among my favorite bits of his writing (I actually prefer that to The Silmarillion's account), and "Songbird" is a wonderfully compelling expansion upon that.   I love each and every carefully chosen phrase and word and the symbolism they invoke, every subtlety, the rhythm you create, and the haunting imagery that weaves itself into Finrod's demise.   The opening verses...

"This old cold

how like a sly lime
this peering hollow
in an evil hour,
sings into your bones.

...immediately grabbed me and did not let go. 

Poetry is such a difficult art form and intimidates the bejeebus out of me, but this poem and your other works here clearly demonstrate your mastery of verse.  Beautiful work!