Frank Ocean has been one of the more fascinating figures in contemporary music since his early-2010s arrival. A singer and songwriter whose artful output has defied rigid classification as R&B, he has nonetheless pushed that genre forward with seemingly offhanded yet imaginatively detailed narratives in which he has alternated between yearning romantic and easygoing braggart. Known first as a writer and Odd Future affiliate, Ocean made his solo debut with "Novacane" (2011), a single regarding a fling that could be read, in part, as a criticism of commercial radio, yet it found...