MarauderX
Explorer
I like to use music without words and keep it innoculous so no one knows when it stops and doesn't interrupt the game. Classical is great for that, and soundtracks from movies (as mentioned) are almost can't miss for ambiance.
Some suggestions:
Hunt for Red October is nice with the Russian singing
Last of the Mohicans
Gangs of NY
Braveheart
Some suggestions:
Hunt for Red October is nice with the Russian singing
Last of the Mohicans
Gangs of NY
Braveheart