Been playing two hours of Darksiders on my PC, after getting it during the sale. It is awesome, but that is not why I am typing this. The reason is this: every time I blow the horn "Earthcaller" I get the feeling War is only dreaming... 
At the 7 minute mark here you can hear the Earthcaller. 
While you can hear the sound I am thinking of here. 
 
This makes the game a lot deeper, and more meaningful. GOTY 2010.