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.
I-Doser 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