As someone generally averse to the fact that album releases never seem to slow down any more, even at the end of December, I managed to miss Chief Keef’s 4NEM when it dropped in late December last year. Known for pioneering drill before it splintered into a thousand different global subgenres, the Chicago rapper is beloved for the kind of abrasive, potty-mouthed raps that older listeners shake their fists at but which send younger listeners into a craze.