Dubstep, the bass-heavy electronic music that evolved out of south London in the past decade, has become diffuse to the point where a prefix is required to describe its current incarnations. One of post-dubstep's bright lights is Mount Kimbie, a London duo who delivered two promising EPs last year. Their debut album pushes the sound into lonely, fragmented places, but locates pockets of warmth. The haunted piano-wire of "Before I Move Off" is nicely offset by a strolling guitar riff and playful vocals. It may feel slight at times, but Crooks & Lovers leaves you wanting more.