Binaural beat therapy uses various frequency tones of monotonous music which entrains the brain waves into a specific frequency wave to benefit from the effects of the range.  Although each range has a fairly wide spectrum of frequencies the different frequencies within the range also have a set of specific results. 

There are other binaural beat therapy frequencies which fall into the Theta range and the listener experiences different benefits of the binaural beat therapy within the specific range. 

Binaural beat therapy of 4 Hz is associated with increased extra sensory perception, astral projection, telepathy and other types of out of body experiences.    

Although there are some sceptics, the benefits of increasing your ability to engage in astral projection and other types of out of body experiences helps to make you feel more relaxed, which puts you into a better frame of mind to be able to deal with daily tasks. 

Relaxation techniques work differently for each individual, the same can be said for binaural beat therapy, even with binaural beat therapy of 4 Hz there is no guarantee that this type of relaxation technique will work effectively for you as an individual, but before you start practicing binaural beat therapy by yourself ensure that you find a qualified therapist to help you through the first few sessions in case you have an adverse experience.