For today's Sleep Song, composer Eduardo Rivera ran computerized string pads through an old tape recorder, resulting in the airy sound heard throughout, reminiscent of a gusty breeze alighting falling leaves. Sampled sounds of crickets, bowed kalimba, and an e-bowed piano add to the rich, sweater...

After hearing the sound of a wind chime floating through his neighborhood, composer Eduardo Rivera is reminded of a stay in the mountain town of Idyllwild. "The house had these huge wind chimes, that I later learned are called 'King David's Wind Chimes.’ These chimes are larger, deeper, and more...

Created using a new musical software called Collage, today's Sleep Song begins with a chord like a question, as if asking whether it's alone in the universe. The response is soothing and celestial, elegant, a drone of chords, rippling out like ribbons of color in deep space photography. There's a...