OMG! Was this around 2010+. Karthik voice was so so different. Miss this voice. That's why I fell in love with his old songs (playback). 2001 - 2010++). Now his songs for almost decade don't really sound amazing. Just enjoy his live performance now. His voice used to be rather soft. Now his voice is harder and quite heavy but 100% suiting Ilayaraja concert songs.
It cud be a video sync problem also... Karthik is the passionate singer who loves to perform live on stage... U can even hear his breathing sound in between...
This is only stage perfomance not kachery... He just perform beautifully... He know people's taste... According to that he sing😊ilayaraja know he is a good singer... So give oliyile song to kartik😊