This book is on the contribution of the 20th century musicians popularizing the devotional verses by the Saint Annamacharya of 15th century praising his Lord Sree Venkateswara of Tirumala hills, Tirupati Andhra Pradesh in India. The Saint made several compositions (keertanas 32,000) worshipped the Lord and his Consort, with his staunch devotion. His compositions illustrate the nine types of devotion (navarasa bhakti) A few eminent composers of the 20th century are selected for their tunings of Annamacharya compositions and views in changing the original ragas used by the saint. This book is useful to know the Biographical details of Saint Annamacharya description of raga system pertaining to that century and the analysis of the origin and developments of musical forms of the compositions. A detailed list of compositions tuned by the selected composers of 20th century is also very much useful for future musicians.