Question: From what film is a Tamil song composed by A. R. Rahman with lyrics written by Vairamuthu, that features the vocals of  a playback singer of Indian cinema with a career spanning over three decades?
Sentence (from "Semmozhiyaana Thamizh Mozhiyaam"): It is the official theme song for the World Classical Tamil Conference 2010, encapsulating the contributions of Tamil culture and literature down the ages.
Relevant evidence: No