Introduction: In presenting the case of a 14 year old teenage girl with depression disorder,school refusal,and social anxiety,the author discussed about the music therapy assessment process to understand the issue hidden behind the diagnosis,and the cooperation with two professions perspectives was also the parallel thinking of the inner and outer self of the case.Method: In this case report,perspectives from music therapy and psychiatric professionals were included.The author reflected upon the interpretation of assessment through music process,and the deployment of symbolical meaning through the therapeutic use of sound and music is described.Music therapist assessed the choices of music instruments representing the conflicting inner self,who speaks silently in the face of the psychiatrist.In treatment,the psychiatrist provides cognitive-behavioral strategies to promote outer coping mechanism,whereas the music therapist explore the inner fear and re-establish the vulnerable attachment relationship.The dialogue between the music therapist and the psychiatrist is conflicting in the way of clinical terminology and intervention orientation;however,it is not-conflicting in the way of transference relationship.Conclusion: effective music therapy assessment helps with the fuller understanding of the issue behind diagnosis;the cooperation of music therapy and psychiatric profession is shown.