This stuff works, its difficult to explain, but you get a set of stereo headphones, and play the track, which is two (Bi) notes of slightly different pitch, which alters your brain's (neural) frequency, allowing you to focus, reach deeper or lighter states of sleep, and even simulate the effects of drugs (Idoser)
In Binaural Beats, the frequency listed is not the tone being played, it is the difference between the two tones. Since they're panned out into different earbuds, the tones don't physically cross, or else they'd produce the beating sound that a slightly out of tune instrument makes. Your brain hears both tones though, so it actually collides in your brain and beats at the frequency listed.
This is why it doesn't really matter what headphones you use, because they aren't actually producing subsonic frequencies.
Here are a few, there are a few free ware programs that allow you to create your own tracks. For instance, if I wanted to study for half an hour and then go to sleep, I could create a track that starts at about 40hz, going down to 8hz, which would put me in a state of REM dreaming.
http://gnaural.sourceforge.net/(For all of you with iPods)Just put in, for example 40hz Binaural Beats on youtube, heres a chart for what frequencies do what:
Frequency range Name Usually associated with:> 40 Hz Gamma waves Higher mental activity, including perception, problem solving, fear, and consciousness
13–39 Hz Beta waves Active, busy or anxious thinking and active concentration, arousal, cognition, and or paranoia
7–13 Hz Alpha waves Relaxation (while awake), pre-sleep and pre-wake drowsiness, REM sleep, Dreams
4–7 Hz Theta waves Deep meditation/relaxation, NREM sleep
< 4 Hz Delta waves Deep dreamless sleep, loss of body awareness
(Taken from wikipedia)Don't use these to often, constantly changing the frequency of your brain can give you a really bad headache2-3 times a day is fine if its only for 15-30 minuets, but space them out with 2-3 hours in-between each use.
