I’m probably a n idiot I had never heard this before, “The Song of Durin” fully orchestrated and sung.
On the off-chance that you haven’t listened to a lot of music based on Tolkien, here’s a bunch of it:
The fall of Gil-Galad is quite nice:
Has there ever been a good acoustic rendition of the Ainulindale?
Yes, but only once.
“Far Over Misty Mountains Cold”
performed by ShaDoWCa7 (I don’t think she’s our ShadowCat.)
Or, by the Third Marine Air Wing band
mbh, here’s that song from the Hobbit soundtrack: The Misty Mountains Cold - The Hobbit - YouTube
Here’s the Professor himself, reciting “Namárië”: - YouTube
And a later version of “The Song of Beren and Luthien”: The Song of Beren and Lúthien - Clamavi De Profundis - YouTube
Unfortunately, the music does not match the written description.