Future Islands are more than a buzz band. More than an overnight sensation. More than a dancing meme tossed around Twitter. Much, much more. However, for those unsuspecting members of the public not already included the quietly growing Future Islands fan-base that has nurtured them through three albums over the last six or so years, the globally celebrated Letterman appearance must have been something of a shock to the system. It’s a perfect piece of heartbreak pop music, beautiful, serene, performed by three deeply concentrated musicians and a very emotive figure at the centre of it all reaching, stretching, bending, shaking, quivering, not just his body but his voice also. It was a moment, a moment of brilliant and heartening unselfconsciousness that continues to domino its way around the world while a new album Singles, a gorgeous collection of spacious synth-pop nuggets, full wrought reminiscence, soul-searching and the wise remnants of broken relationships, reveals itself to the world.