Like I said previously, I hope we can never find an answer to this since we are bowled over by the different sounds and dimensions these directors bring out from Rahman. However it would be nice to know who's popular amongst us. I've stuck to directors who've done more than a couple of movies with him (hence left out Omprakash Mehra). So do cast your vote for your fav combo here --->
http://groups.yahoo.com/group/arrahmanfans/surveys?id=2663048
