“Four Flats” is C4 reminding us that his production repertoire stretches beyond his standard trap-rattlers, and does so by mixing an exotic cocktail for Atlanta MC, Rome Fortune, to guzzle down and spit back up. Rome’s liquid lines poured over a chopped and strained chant and sprinkled with sparse strings and bassy drums is a potent concoction. Using his own brand of minimal repetition and an amorphous flow the ATL emcee grabs and pulls at yours ears even outside of a hook. Confidently bouncing and gliding over C4’s production is no new feat for Rome Fortune but “Four Flats” is the most mature and uniquely evolved collaboration that the two have shown us thus far.