I have sooo many favorites, but the song i listen to most often is For those who died (Return to the Sabbat Mix). 
 
other favs
-English Fire
-Coffin Fodder
-Bathory Aria
-Honey and Sulphur
-From the Cradle to Enslave
-Saffrons Curse
-Nemesis
-Summer Dying Fast
-Better to Reign In Hell
-The Forest Whispers my name
-Queen of Winter, Throned
-Her Ghost in the Fog
-Hallowed be thy name (cover song)
-Mr. Crowley (cover song)
-The Death of Love
 
I just love cradle waaaaaay too much.

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*Devil to the Metal*