I've always considered Ian Anderson and Jethro Tull prime candidates for scoring a Tolkien film project. "Dun Ringill", a very eerie and netherworldy tune, would be appropriate for a Numenorean or Elven mariner's theme, as a storm tossed ship traverses the troubled Belegaer:
http://www.youtube.com/watch?v=dqVl_ZLbL5I
The weather's on the change...
Lines join in faint discord
And the stormwatch brews
A concert of kings as the white sea snaps
At the heels of a soft prayer, whispered
Clear light on a slick palm
As I misdeal the day
Slip the night from a shaved pack
Make a marked card play
Call twilight hours down
From a heaven home
High above the highest bidder
For the good Lord's throne
In the wee hours I'll meet you
Down by Dun Ringill ---
Oh, and we'll watch the old gods play
By Dun Ringill
We'll wait in stone circles
`Til the force comes through ---
Lines joint in faint discord
And the stormwatch brews
A concert of kings
As the white sea snaps
At the heels of a soft prayer, whispered
In the wee hours I'll meet you
Down by Dun Ringill ---
Oh, and I'll take you quickly
By Dun Ringill