Kollywood is witnessing healthy competition between various stars. Both Rahman and Yuvan are bussiest music directors but they respect and love each other. Yuvan sang a song in Rahman’s film ‘Mariyan’.Dhanush, Parvathi starred in the film directed by Bharat Bala. Yuvan went to Rahman’s studio to sing the song, the moment ARR asked him.Now Yuvan is tuning for Ajith’s ‘Valai’ directed by Vishnuvardhan. AM.Rathnam is producing the film. This time the moment Yuvan requested, Rahman readily agreed.