I just tested this method while driving on the highway. the advantage of being single allowed me to produce beautiful sounds with accompanying CD that is simple and very well done. just find a theme eg sadness which it is desired to free themselves, to think about it and to plunge by practicing the required sounds, these sounds are within the reach of all, and follow the instructions. Which brings up is always simple. I recommend this CD brings a nice release I tested it, it works very well! the result was to live serenely emotionally consuming situations while remaining in understanding, discernment and openness of heart. What more?