I had a lot of Bengali friends in Delhi. The bands there had Bengali musicians: for example, Indian Ocean. We use to have a good amount of adda and sing songs through the night.
It is hard work composing a song for a film and showing it to makers: 50% of the tune remains the same, and the remaining 50% is changed to suit the script.
After Silk Route disbanded I came on my own, and through the years, I have sung a few film songs while writing songs for my album.