Bollywood in the '60s and '70s, bringing a world of influences to Hindi film music. The trifecta of R.D. Burman, Asha Bhonsle (playback singer) and Helen (dancer/actress) churned out hit after hit with songs like " O Haseena Zulfonwali " from Teesri Manzil (1966) , " Piya Tu Ab To Aaja