Ilaiyaraaja is the first composer to win a National Film Award in the newly instituted ‘Best Background Score’ category. The Award was given, not just because Ilaiyaraaja's score for the Malayalam film “Keralavarma Pazhassi Raaja” was the best of that year, but also because, in 35 year long career as a film score composer, every year, one of his films' score was always the best of the year. The book “Moods of Ilaiyaraaja” is a brief introduction to the genius of the film score composer Ilaiyaraaja. With an extensive analysis of background scores of few of Ilaiyaraaja’s films, the book elaborates why Ilaiyaraaja is and ever will be the best film background score composer in India. The book also traces the evolution and background of film scores in Indian films, in general.