Ohhkay, yes, I have heard that song, yes it is in coke studio, and is very, very beautiful, but it's an assamese folk song :) Papon has an amazing voice,no?

If you love coke studio, these two bengali songs(not full, but in parts), you can give a listen:

https://www.youtube.com/watch?v=FnDmg-cBVsA

https://www.youtube.com/watch?v=o5iNbmDbViA

Hope you'll like them :)