Jedi Mind Tricks - Books of Blood.
I love rap when it makes you think and addresses issues other than shooting people, taking drugs, making money and scoring girls.
Unfortunately, this song doesn't actually have a video and I'm not even sure if the picture* used in this video comes of from anything connected to the band, but it's still an awesome song.
"We are all books of blood, for once we are open, we are red"
If you think that's not bad I recommend checking out more 'Jedi Mind Tricks', a couple of good album's to look out for are 'Violent by Design' and 'Legacy of Blood' although I recommend all of thier stuff, especially the older work.
Here's an example of something from way back when, probably one of my favorite songs as well;
*If you were wondering the picture is an ashtray engraved with the iconic free masons emblem, the ashtray is full of shotgun shells and is rested on an open bible. Don't ask me how I know, I just do.
