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My main problem with Negative XP is that many of his songs just flow really poorly and either don't rhyme or the rhymes are really hamfisted. This one doesn't though:
https://www.youtube.com/watch?v=SamS-1kNXuU
SHOOT FIRST, ASK QUESTIONS LATER
A GUN IS THE GREATEST NEGOTIATOR.
This rhyme is great 
BEAT BEAT BEAT, KILL KILL KILL
STOMP THEM RAW TILL THEY LOSE THEIR WILL