Sholay - the baap of all Hindi films opens up with a very very cool music piece. I wish I would post it here. It is an amazing piece of artistry by R.D.Burman ! I hope I could be atleast half as good.
I would try to find a few places where you could locate the song and listen to it.
There is this part in the piece where its all whistles and nothing else and probably thats the best part of this wonderful piece of art.