Like Avenged Sevenfold (or A7X, as it's sometimes styled) or hate them, you have to admit they're a pretty unique band in the world of metal and hard rock. Their lyrics deal with deep subjects such as death, hell, and the Bible (their very name comes from God's condemnation of Cain in Genesis). And they have a very unique singer to match: Matthew Sanders, or as he's known onstage, M. Shadows. Like his band, Shadows can be an acquired taste. In the beginning, Shadows did a lot of scream work…