An array of tall, sinuous horns fires vertically into subsurface chambers to create very low-frequency melodies that are felt as vibrations through the soles of the feet. A contralto harmony line is produced by the reclining horn. Subsurface chambers tune the sound and contain it within the immediate area. The translucent horn forms of structural fiberglass and stainless steel have a pearlescent mica surface and illuminate from within at night.