This turned out to be crazy hard. So many songs to choose from.
1. Black Sabbath - Sabbath Bloody Sabbath
2. Slayer - Reign in Blood
3. Marshall Law - Bloodlines
If bloody doesn't count, bump the other two up a notch and make Powerwolf - We Drink Your Blood the #3 entry. Otherwise it's an honourable mention. If bloodlines doesn't count because it's two words in one, add The 69 Eyes - Framed in Blood.
If you can also count BLEED, then the whole list changes! Starting with the Angel Dust song by that name, which would be #1.