To date, some 10,000 crop circles have been catalogued, in twenty nine countries worldwide, and their anomalous features continue to defy human replication: plants bent an inch above soil; their cellular structure altered; stems lightly burned around the base; alterations to the crystalline structure of the affected soil; the evaporation of ground water, alteration of the local electro-magnetic field, and dowsable, long-lasting energy patterns, not to mention hundreds of measured effects on the human biological field. Sounds have been identified at the sites of some of the circles during their formation, suggesting that sound is one of the likely causal or organizing factors in their creation. This article presents evidence and theories in support of this hypothesis.