Book, Focusing the Whole Brain: Transforming Your Life With Hemispheric Synchronization by Ronald Russell includes a free Hemi-Sync Audio CD

Imagine a technique that would allow you to conduct your own explorations into consciousness. Imagine that this technique is safe, inexpensive, easy to use, and endlessly versatile. Imagine Hemi-Sync. Invented by sound engineer Robert A. Monroe more than 30 years ago, Hemi-Sync uses audio technology to synchronize the functioning of the two hemispheres of the brain ... today trainers and workshop presenters in some twenty countries and individuals from fifty countries have traveled to attend courses employing Hemi-Sync at The Monroe Institute in Virginia. Countless more use Hemi-Sync CDs and tapes for specific purposes. Focusing the Whole Brain provides a readable introduction to a whole new world of abilities greater than you ever thought possible.