One third of the depressed patients do not respond adequately to conventional treatment. This seems to be associated with increased production of proinflammatory cytokines such as TNF-a and IL-1, as well as dysregulation of cortisol levels. This project aims to investigate Investigate the effectiveness of TaKeTiNa music therapy in the treatment of patients with clinical diagnosis of moderate to severe depression Investigate the physiological and pathophysiological effects of TaKeTiNa using novel blood based biomarkers of depression, especially LDL cholesterol as well as on immune system function in order to establish immune system based biomarkers for better diagnosis and therapy monitoring of major depressive disorder.