For almost a decade now, Run the Jewels has been a much-appreciated opportunity for two grizzled veterans of the music industry to flex their political inclinations, while also having fun doing so. What made them so appealing to so many, though, can be attributed to a truth self-evident since the release of Killer Mike’s 2012 album R.A.P. Music: two is so, so often better than one. When Mike and El-P come together, the synthesis of their abilities carries them beyond the limits of their individual genius, yet even as they continue to refine their formula, the fruits of their persona threaten to become conventional. While El-P is pulling this much of the weight when it comes to Run the Jewels as a vehicle for social commentary, it becomes clearer than ever that creative beats and hard-hitting punchlines can only carry you so far, and the duo are sorely in need of some fresh ideas. Make no mistake: these criticisms are not uttered because RTJ4 is bad, or average, or even merely good. This is a great album that overcomes many of the flaws of its predecessors, but more than ever before the uniformity of the duo’s style threatens to wholly consume their artistic talent, and it is uncertain how much longer they can stave off the decay of their purpose.