Stock Photo - Reportage in the Chrysalide wellness centre in France. According to Dr Bourdin, music therapy is a therapeutic and personal development technique. A precise listening test is performed, then a corresponding course of treatment using sound is established. This will rebalance the hearing system, which in turn produces dynamic, remedial and preventative effects. The treatment involves sessions retraining the hearing system, using music that has been modified to reflect the listening curve obtained from the listening test. Each frequency corresponds to a part of the body.