And the lyrics go beyond death metal, granted they're not as graphic in other genres, but none the less songs of killing are rampant elsewhere. Eric Clapton's I shot the sheriff. Sure he's not talking about shooting the guy repeatedly beyond recognition, but the main drive of the song is about him shooting a guy, thus him killing another man. So he didn't eat the guy's intestines, he's still dead all the same. I don't know about Cannibal Corpse making songs based around Ed Gein, but I do know Slayer did. Dead skin mask. A lot of songs, cd covers, and general ideas are based on or pictures of, or even directly about a real death incident.