From The Monroe Institute.It's music for the intellect and the spirit. Recent studies have shown that there is a correlation between a relaxed state of being and accelerated learning. The music of Mozart (the Sonata for Two Pianos in D-Major) as performed by J.S. Epperson, combined with Hemi-Sync concentration frequencies, helps make any mental task more efficient.The perfect way to jump-start your conscious mind and unlock the secrets of the universe!60 minute CD. Headphones required.Learn more about Hemi-Sync, and get your FAQ answered.Learn more about Hemi-Sync creator Robert Monroe.Do not listen to Hemi-Sync while driving or operating heavy equipment, or with other devices that may influence brainwave activity. If you have a tendency towards seizures, auditory disorders, or adverse mental condition(s), do not listen to Hemi-Sync without first consulting your physician. Do not use Hemi-Sync with Dolby or other noise-reduction systems, as doing so will diminish the effectiveness of the Hemi-Sync signals.