This research evaluates how Indian classical raag music functions as therapy for psychiatric disorders by studying both traditional cultural practices and contemporary neuroscience findings. Music serves as a fundamental cultural instrument throughout human history until scientists recently validated its psychological and neurochemical effects. The structured emotional power of raag- based therapy distinguishes it from generic music because it effectively activates both affective and regulatory brain systems. The research investigates four major psychiatric conditions including Major Depressive Disorder (MDD), and Generalized Anxiety Disorder (GAD), and Post-Traumatic Stress Disorder (PTSD), and insomnia through analysis of their physiological and psychological mechanisms and standard treatments and evaluates the growing evidence for raag therapy as a non invasive culturally resonant complementary intervention. This study examines the potential of raag music integration into holistic mental health care through a diverse range of sources that include DSM-5 criteria and neuroimaging studies and clinical music therapy research and ethnomusicological traditions.