What are Binaural Beats? Tones produced specifically for the purpose of altering your brainwave frequencies. The posts in the link also contains an exclusive free binaural beats sample of a pure alpha wave.
Graphic showing the development of the human brain for the first 21 years of life. As we grow, our brain grows and matures, but does not become fully mature until age Our brains develop most rapidly in the first few years of life.