This version matches the key of the song from the movie. I worked this out by ear and 
feel it to be the best match online so far, but any comments are appreciated!

TUNING- can be played with these chords in standard tuning, but D (full step down) works 
best in my opinion as you can use mostly open chords = easier.

Verse 1 (hummed, not sung)

Gm Bb C Gm
Am C Gm
Am Bb C Dm
Bb Am Gm

Verse 2

    Gm       Bb    C         Gm
Far over the misty mountains cold
            Am        C       Gm
To dungeons deep, and caverns old
   Am   Bb         C        Dm
We must away, 'ere break of day
            Bb   Am        Gm
To find our long forgotten gold

Verse 3 (slight change)

    Gm                Bb C   Gm
The pines were roaring on the height
               Am      C      Am
The winds were moaning in the night
    Am       Bb      C       Dm
The fire was red, it flaming spread
               Bb      Am          Gm
The trees like torches blazed with light

END. I like to hum another verse and gradually slow down