Researcher H.W. Dove discovered that when two tones close in frequency are presented, one to each ear, the brain detects the difference between them as a third frequency. The two hemispheres of the brain entrain to this binaural beat rather than the audible tones. For example, a 90 Hz and 95 Hz tone will induce a 5 Hz brainwave cycle. The lower or carrier tone also influences consciousness. Carrier tones for the journeys on this CD are 136.10 Hz (C# or OM), the primal sound from which the universe constantly emanates, and 172.06 Hz (F or Kung), the key tone in ancient China for attuning to Tao, the guiding force of the universe. Each journey ends with a callback and has a binaural beat of 4.5 Hz, the theta rhythm associated with the deepest states of shamanic consciousness. 30 minute journeys are split into two tracks. Select Track 1 for a 30 min journey or Track 2 for 15 min. Tracks 1-2 Theta OM. Tracks 3-4 Theta Kung. NOTE: Our music sounds best on Winamp and iTunes Free Media Players. Headphones required....More >< Less