A one-off project that quickly evolved into a hip-hop superduo, Run the Jewels feature rappers El-P and Killer Mike. Formed after El-P produced Killer Mike's 2012 album R.A.P. Music, the duo released Run the Jewels in 2013, an album credited to Killer Mike and El-P and released on Fool's Gold. Critically popular and with a sizable fan base to boot, Run the Jewels quickly evolved into a going concern when their sophomore effort, RTJ2, landed in 2014. A remix version with all music replaced by cats was also released that year as Meow the Jewels.