Use Headphones for BEST EFFECT! -- I'm only testing this "music" at this time but the promise it that it increases I.Q. I'll be the judge of that, I guess. How would you know if your IQ is increased after listening to this anyway? They used to say the same thing about Mozart's music and called it The Mozart Effect. Frankly, the following sample sounds like typewriters or a piece of running machinery. I don't understand how they can possibly promote it as an IQ booster. I'll report on this more when I know more. The following video is a PLAYLIST, as well, so you can scroll ahead to the next sampler video if you lose interest in the current one.