Reference
Binaural beat recordings are specially generated sounds, designed to alter your brainwaves - bringing about different states of mind, such as happiness, creativity, or relaxation. They're perfectly safe, non-addictive, and can be used as often as you like.
BinBeat is the leading the research in how specialized audio sequences can significantly alter your mood, and create entire simulated experiences.
Read this for a simple explanation.
Binaurals and Anxiety
Affection of Mood
Sensed Presence / The Mind's Eye