Swathy, I guess the source for today's pick was the movie itself that was telecasted in one of the channels yesterday.
Co-incidentally I was watching Aavaram Poo in one of the channels around the same time. No points for guessing what song I was waiting to watch in that movie... Of course, our first song in this thread.
Coming back to today's pick, nativity is one strong factor for this song and in fact all songs in this movie. I thought Janaki's voice suited Sukanya well, begining with this song and following up with few other songs in Chinna Goundar, Chinna Maapillai, Walter Vetrivel, etc. May be this song was a trend-setter for a female lead's voice gelling well with a particular actress.