In the 90s the book Behold A Pale Horse was popular among rappers and a lot of rappers were inspired by this book.
Immortal Technique - Cause of Death
... You think illuminati's just a conspiracy theory?
That's why Conservative racists are all runnin' shit
And your phone is tapped by the Federal Government
So I'm jammin' frequencies in ya brain when you speak to me
Technique will rip a rapper to pieces indecently
Pack weapons illegally, because I'm never hesitant
Sniper scoping a commission controlling the president ...
Pusha T - Doesn't Matter
“Since y’all claim I’m Illuminati, tell me why would you try me?
Kennedy, John F., or Bobby
Almost caught Reagan, but they stopped us at the lobby
And that was broad day, so how the fuck you gon’ stop me?”
Hopsin - Nocturnal Rainbows
"...The change he's making isn't good, that's just how you conceived it
It's like we all broker than ever, it's due to reasons
Dealing with self-beneficial plans and the movement he's with
Illuminati, or whatever they go by
They’re the reason real events happens, and we don’t know why”
Gamma Ray is a metal band which has created an album about the New World Order conspiracy theory called "No World Order". The first song, Introduction has the following lyrics:
You've come to take control
You can take my heartbeat
But you can't break my soul
We all shall be free
You'll never take control
Your new world order
Will lead to none at all
We all stand before you as one
Heaven is for everyone
To be free from the dark”