Improvisations based on 24 Preludes. Here a rule states that melodies must only emerge from harmonics or open strings of a guitar. Harp-like. Occasionally, literally a harp. Notes played in this way sustain and resonate out over each other in an ebb and flow of accumulating and receding overtones. Grasses wavering, animals skittering. Another rule conscribes melodies to a single key. Each piece has its own elements complimentary to the Prelude - some determined, some by happenstance. Some alpine, others grazed. Meadow.