Sounds are generally used in games to set some kind of mood while the player is moving through the world. While we still don't have much information on the game, the folks from Earthrise have provided us with these two tracks from their upcoming MMORPG.

And I Shall Remain

The cataclysms of the Third World War have left cities in ruin, filled only with death and despair. Those brave enough to inhabit these areas can sense the ghosts of the men and women lost; their ghost-voices calling to them in the dry winds. Amidst the devastation, the old cities hide unknown treasures and secrets that may prove to be deadly traps for explorers. The weathered streets of these perilous cities have become battlegrounds for short, but fierce, clashes between government loyalists and rebel forces.

Check out both tracks here.