You’d be forgiven for checking whether it’s a piano at all. The figure that opens “Like A Light Bulb” has been so thoroughly softened, so stripped of its hammer and attack, that it registers more like a dripping tap in the next room: a handful of notes circling on a loop until you stop hearing them as music and start hearing them as part of the furniture. Into that comes Sophie Bickerdike, pitched just above the pattern and never once pushing against it. Her voice has blurred, warm edges of…