This study aims to explore the \'Expressive-Supportive Music Psychotherapy\' through songwriting for adults with schizoaffective disorder. The subject has deeply rooted anxiety, anxiousness, guilt, and depression due to conflict and unsolved desire resulting from abnormal family environments, anger towards parents, and socially unacceptable emotions and behaviors. The songwriting method has been employed to such a patient to express one\'s feelings and thus by supporting the feelings, provided opportunities to see through one\'s inner self and therefore led him/her to positive thinking. Motivation enabling a proactive role has been employed in this process. \'Expressive-Supportive Music Psychotherapy\' through songwriting has opened the road from a \'river of depression to a sea of hope\' for the patient suffering from difficulties with having rational thoughts, expressing emotions, and displaying appropriate behaviors by providing a stage for expressing oneself.