Singing bowls, sometimes called healing bowls, can be traced back to Asia as early as 2000 BCE. Some are made of an alloy of seven different metals corresponding with seven astrological planets, which create a range of different sounds and overtones. The seven metals are gold as Sun, silver as Moon, mercury as Mercury, copper as Venus, iron as Mars, tin as Jupiter, and lead as Saturn. Some bowls are made of only five or three of these metals. Bowls vary in form, depth, color, diameter and composition. They can be used as cooking vessels or as offering bowls, beat instruments, for meditation or relaxation. Bowls have a double effect, with sound and vibration. Science has confirmed that music, as an organized form of sound, can directly affect mood, brain waves, the nervous system and body chemistry. Music has played a key role in the religious and spirituals practices for many centuries. Music has been applied to aid digestion, induce sleep and treat mental disturbances.The vibrations of singing bowls stimulate the body to recreate its own harmonic frequency and help produce the alpha waves that are present in the brain in deep relaxation. Singing bowls of all sizes are said to clear the atmosphere around us of negative energy and emotional blockages. Many people feel they are touched and cleaned in their soul when they listen to the sound of the singing bowl. As some people describe the sound of a singing bowl: Time stands still. A feeling of peace, relief in aching parts of the body, or contact with some thing beyond daily life. It is said that renowned Masters of Sound among Tibetan Lamas have used singing bowls in secret rituals. They have traveled out of the body through the power of sound. If you find a real singing bowl, you can use singing bowls instead of a cup of coffee to help you digest lunch, fall asleep and recover from illness. Tibetan bowls are of Nepalese origin and are used by Newari during their ritual fire ceremony. There is a link between bowls and ayurvedic approach of music therapy and medical care.