50 CENT celebrates the new year by releasing a new freestyle, "This Is Murder Not Music". His new joint is just a warning shot of what's to come. The aggression in music was SPARKED by Fif 10yrs ago & its just recently returning in 2013/14. This content is MEAN. This hook is MEAN. This simplistic beat is MEAN. The sh*t talking is MEAN. 50's sh*t talkin' is unmatched cause we know its coming from a real place. His next album, "Animal Ambition: An Untamed Desire…