"Long time back, when I had come for a trip to Kolkata, the noble lady told me to work for those poor kids. This inspired me to do the film," said the disco king.
"Slum Stars" is a movement by the veteran musician to give a platform to gifted artistes from the slums of Mumbai.
To energise the youngsters, Lahiri created a short film on the issue.
"I did the film with some kids from slum areas in Mumbai. I am happy it has been very well taken internationally."
The film received the best short film award at the festival in Sydney earlier this month.