/> This has got to be the most unlikely coming-together in the music world. Last week composer-turned-singer Bappi Lahiri and actor-turned-amateur-singer Sanjay Dutt warbled a dreamy ballad for Sanjay Gupta's Alibaug.

The song Raat khamosh hai subah bolegi written by Neelesh Mishra was composed by Bappi Lahiri's son Bappa.

Apparently Sanjay Dutt was so moved by this deep ditty that he broke down at several points while singing with his unlikely crooning companion.

Gupta who'd be using the Dutt-Lahiri ballad for the promotional video of Alibaug says he has never seen anything like this before.

"Sanju has been singing quite often these days. He sang in my film Zinda . Then he even did a duet with Asha Bhosle. But in Raat khamosh hai Sanju carries the notes like a true professional."

The manner in which the baritoned actor managed the intricate notes has spurred him on to seriously consider cutting an album on his own.

Says Gupta, "Bappa created a fantastic composition. I wanted a New Orleans Jazz-Blues kind of feel to the tune. Bappa gave me exactly that. I'm a big fan of Bappi-da.When he agreed to sing for Alibaug it was a special occasion for my production house and for him. This is the first time that Bappi-da has sung for his son. It was an emotional moment for all of us."

At first Dutt was shy about matching chords with the veteran composer-singer. "But soon they hit it off like two music-minded people always do. It was great fun for all of to watch them sing together," says the thrilled Gupta.

Adds Bappi Lahiri, "Sanju Baba has always been my favourite. He has sung some of my biggest hits like Tamma tamma. But this was a different territory. I not only sang Raat khamosh hai with him we also shot the music video together. And to have my son Bappa make me sing his first song! Many decades ago I had sung my father Aparesh Lahiri's first song. Now for Alibaug I've sung for my own son. This is the first time since Amar Prem (in which Sachin Dev Burman sang for son RD) that a father-composer has sung for his son. How was Sanju as a singer? Ussnein sambhaal liya."