XX, The - Coexist

In the years between their debut and Coexist, the xx's sound took on a life of its own, thanks in large part to Drake's hit duet with Rihanna, "Take Care," which sampled Jamie Smith's collaboration with Gil Scott Heron, We're New Here. That single embodied and popularized the xx's aesthetic to such a degree that on first listen, Coexist can sound like demos for a potential follow-up. In turn, these songs lay the trio's R&B roots bare, with an extra emphasis on that last word: while second albums are where bands usually add more elements to their sound to keep things interesting, the xx go even darker and sparer than they were on their debut, which was pretty sparse and dark to begin with. On the lovely album opener "Angels," elegantly serpentine guitars -- which recalled the Cure and Durutti Column on xx but are now entirely their own -- echo into spectral shadows, and fragments of beats and melodies hang unresolved in the air, surrounded by vast expanses of nothingness. Any track