Brainwave entrainment is the use of some external stimulus, usually different sounds that a person will hear with stereo headphones, to induce a certain level of brain wave activity. When a person’s brainwave activity is artificially altered by these means, it will subtly shift their awareness and perception.

Using binaural beats is a common and effective method of brainwave entrainment. In order for the binaural beats to be effective, a person must be using stereo headphones so that they can hear a different sound in each ear.

Most of the time, the binaural beats will be embedded underneath the layers of tracks on a song, usually soothing ambient music or soundscapes, so that the person listening can focus on the music and not on the frequencies they are hearing. If you either find or create effective binaural beat audios to listen to in stereo heaphones, the frequencies should blend perfectly into the background, and you should not be able to consciously notice them unless you really try to isolate them.

via Self Improvement And Motivation: Increase Creativity and Redce Stess Using Alpha Meditation.