Music is the expression of the soul and its deepest yearnings. It catapults human soul to the realm of spiritual ecstasy and experience of bliss. The sacred Sikh scripture Guru Granth Sahib's bulk of text has been composed and compiled in a selected sequence of Indian classical "Ragas". This highly scholarly work highlights the relevance and contribution of Ragas in heightening the effect of the divine hymns. In author's opinion, these Ragas have not been employed by the composers not only for their melodiousness but for enhancing the communication between the Divine and the devotee. Thus, these Ragas have been utilized as means to an end - the end being God-realization and spiritual emancipation of the devotee. The author also analyses the complex nuances of each Rag and its relevance to the different hymns recorded under its heading. It is a highly professional and scholarly work which needs to study by the professional singers of Gurbani.