I am a Tamilian. A green Tamilian. Still when I watch any Tamil song, I always prefer to watch it along with English sub-titles. You might think that it is unnecessary. But once you start watching Tamil songs with English sub titles you will never ever want to watch the song without them any more. I have added screenshots of Tamil songs with english sub titles. Go through the pictures and once you are done, I am sure you would also join the list of people who would watch Tamil songs along with sub titles. So here you go
The pictures are screen shots taken by me from Youtube. So I do not hold the copyrights for any of the pictures.