Poems reveal the linguistic capability and creativity of a person. Poets being driven by a creative impulse, frame imaginative poems that narrate a story, and express emotions in an artistic manner. Poets in film industries write poems considering a situation in the movie and the tune composed by the music director. In this paper, we discuss the design and analysis of an automatic lyric generation system for the Tamil language, which takes scene description (in prosaic form) and tune (in swara format) as inputs, and generates lyrics with the necessary poetic components, such as alliteration and simile, which adhere to the situation and the tune. The idea of the input scenario, which drives the lyric generation process is extracted by identifying causal-effect relationships. Also, the dialect of the speaker (in the input scene) will be reflected in the lyrics, if it is specified in the input scene.