I keep humming his songs, but you can't really call me a singer. His voice has been god's gift and I'll try (to sing in his voice), but if I cannot then we'll pick a singer who can do justice to his songs.

'But as far as the performance part is concerned, it is totally under my control and I'll make sure that I pull that perfectly... I wont leave any room for any finger to find anything missing,' he added.

Kukunoor's narrative in the film would be propelled forward on the strength of Kishore Kumar's songs and he is also in the process of acquiring the rights to the original numbers.

The filmmaker has spent hours with Kishore Kumar's son Amit Kumar and wife Leena Chandravarkar - they gave Kukunoor enough anecdotes to make the biopic authentic.

Interestingly, two more directors - Sudhir Mishra and Shoojit Sircar -

are also set to wield the megaphone on the life and songs of the multi-faceted Kishore Kumar.

While Mishra is looking forward to casting Kishore Kumar's younger son Sumit provided he can act, Sircar's film, which is being penned by Rensil D'Silva, is currently on hold.