The first time I listened to Kabhi Kabhi Aditi from the upcoming movie "Jaane Tu Ya Jaane Na" I told myself "This sounds so awesome but I've heard this before." After spending a few minutes wondering where I'd heard it, I finally found it! :)
Its from the BGM of "Mustafa Mustafa" .. the first line is exactly the same tune. Check out 4:04 to 4:18 of the clip below from "Mustafa" .. it repeats the first line from the song Kabhi Kabhi. http://www.youtube.com/watch?v=_XSstxWel-U Of course, it is hard not to be inspired by Mustafa - one of rahman's all time best! :) Aanand