I think the tone has become more serious with Naan Kadavul and if the music is any indication, Thaarai Thappatai will follow suit. Sethu had the love track to begin with which gave IR more scope to show different shades of emotion. Pithamagan was even more mainstream and produced the lovely Elangathu. With Naan Kadavul, it's become all melancholy. I will have to wait sometime to slowly digest this new monster.