Lately, some new artists have hit the interwebs who are down right addictive and, if all goes well, they will be giving fans the shakes on a massive level. J. Cole’s “A Dollar and A Dream II” affixes graceful metaphors about the throes of quarter-life insecurity to a generous piano melody that makes a clean break from the ever-ubiquitous synth-hop. Jay-Z scooped the North Carolina MC as the first signee to his newly-formed Roc Nation imprint; a move that makes sense since Cole has the same low-key cleverness that has rendered Hov a mega-bajillionaire. He’s young so his mixtape The Warm Up has the requisite knuckle-headed sneaker and swagger rhymes. But the clean production has the classic brooding sensibility of jazz-sampled hip hop from Slum Village and Little Brother. Tracks like “I Get Up” and “Losing My Balance” are that good good.