These two cds from Alex Theory are intended to help with brain function and relaxation through naturally occurring sound frequencies of water and of light. Theory uses chimes and tuning forks to create tones that are mathematical matches for the frequency of molecules of water and the electromagnetic frequencies of light waves in order to stimulate restoration, healing, and relaxation. Between the two cds, I found Light to be more effective, particularly since the tones of track 9 on the Water cd tended to give me a headache after listening to it for a span of time, but then I’ve always been fairly sensitive to sound. These are great cds for listening to while meditating, while in the shower, or as background while reading, cooking, yoga, or nearly any other similar activity. Available as individual cds or as a set from Sounds True.