Third and final installment
This from the Desam, tamil version of the Hindi movie Swades. (Hariharan & Maharajan (and not Mahalingam) with AR Rahman)
These were from function organized by the Tamil film fraternity to felicitate Ms. Jayalalithaa in 2004.
Previous clips can be found here and here
Sorry for nitpicking, the singer should be T L Maharajan (Trichy Loganathan's son).
Thanks.. stand corrected