MUMBAI: Lyricist Madhan Karky, who has penned the song that actor-filmmaker Kamal Haasan has sung for upcoming Tamil film 'Avam', says the experience of having the superstar croon to his lyrics is 'unforgettable'.

"Had a super recording session with Kamal sir. A song for #Avam directed by Vijaykumar & music by Sundaramurthy. An unforgettable experience to watch and hear Kamal sir breathe life into my lyrics (sic)," Madhan tweeted Saturday.

"Kamal sir's voice for #Kaarirulae, a song on a guilt feeling, will be the highlight of #Avam (sic)," he said.

Kamal, who is currently busy shooting for Tamil thriller 'Papanasam', is not new to singing. He has crooned several chartbusters such as 'Anbesivam', 'Unnai Kaanadhu Naan' and 'Kadavul Paadhi'.

Karky is a lyricist, research associate, software engineer, and film dialogue writer, who started his career as lyricist with Enthiran.

He has written scripts for films like 'Mahabali' and 'Masss'. Madhan has penned songs in Portuguese for '180' and in Mandarin for '7aam Arivu' and has also written in 15 different languages for a duet song in Nanban.