In the interview below Richard Armitage talks about how he listened to a lot of Russian choral music to find the sound for Thorin's singing and for the sound he wanted for Misty Mountains Cold.
I have no special knowledge of Russian choral music, but Richard's answer reminded me of all the times in my childhood and youth that I went with my family to listen to the Russian Red Army Choir sing. Does the Russian Army still sing and have a choir?
I was happy to find that YouTube had vids of the Russian Red Army Choir singing and below two songs that were my favorite and they always sang in their concerts. To me they fit what Richard was referring to in the interview.
While on YouTube I thought I would search for more Russian choral singing and here are two that I thought the dwarves would feel are kindred singers.
Update 1/27/13- Thanks to inspiration by my friend Dezmond's comments below, I looked for and found a video of
Serbian Orthodox Church Music:
Now for our own beautiful basso
Thorin (Richard Armitage) and the Dwarves (the charming Hobbit cast) sing Far Over the Misty Mountains Cold