Zen and the serenity of a gentle stream. Soothing sounds 

Relax your mind and let the waves take you. Meditation, study aid, increase your attention span and your ability to relax.
Meditation and relaxation promote positive thinking and help in healing.
This video contains delta rhythms to help with positive thinking and help alleviate depression.
Relaxing music. Deep sleeping, relaxing, stress relief, meditation, hypnosis, learning.