A little night music, please. Actually, there's a lot of it to enjoy on this beautifully conceived and performed two-disc set dedicated to the art of the piano nocturne. The French word means "nocturnal" or "of the night." Though far from being lullabies, these single movement miniatures typically do begin and end softly and reflectively. But like an evening’s sleep interrupted by a bad dream or bout of insomnia, there is often much restlessness and turmoil within.