These audios are designed for creative mental fitnesss and brainwave entrainment sessions.  These sessions contain inaudable synchronising pulses which will control light flashes in the LED LightFrme glasses of a Light and Sound system such as the Theta Technoligies Galaxy, or the Mind Place Protius, Lumina, or Kasina.    You may listen without the light pulse and find that these can be beneficial as audio only.