Binaural beats in general is music created to a specific frequency (Hz) which affects the brain.
This is also called brainwave entertainment because the sound patterns are like waves .
These beats depends on the frequency are :
-Gamma, 30 to 50 Hz
-Beta, 14 to 30 Hz
-Alpha, 8 to 14 Hz
-Theta, 4 to 8 Hz
-Delta, 0.1 to 4 Hz
The names are taken from the Greek alphabet.
You can listen to these kind of "beats" for different reasons : focus,relax,deep sleep,meditation etc. Each one affect the brain in a different way.
If you want to find more about it here are few sources : wikipedia and bebrainfit .
In the video below you can listen to the "focus" one . You can read the video description on youtube for more details.
It may sound to you strange and boring ( and a little "noisy") .
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