It’s official: R&B boy groups are back in style.  With Day26, Brutha, Midwest City, and Nephu busily crooning their way into the hearts of ladies everywhere, the market is a little crowded at the moment, but Sing-Sing, Big Mike, Mr. Jones and K.C. of Ahmir are confident that their take on the subgenre is unique enough to catch the attention of listeners hungry for soulful harmonies.  This Double-U-produced cover version of Ne-Yo‘s Closer certainly doesn’t sound like your average R&B jam – for one, the beat’s endlessly-layered synthesizer parts make the cut feel more claustrophobic than sensual – not that that’s a bad thing – and secondly, Ahmir has a secret weapon in DJBooth favorite K. Sparks, who displays his trademark lyrical agility at the tail end of the track.  Though Sparks should bring a ratings boost from Booth regulars, the question remains: does this up-and-coming quartet have what it takes to climb to the top of the R&B-group pile?