Nasir Hussain, prolific Bollywood producer-director and uncle to Oscar-nommed Aamir Khan (“Lagaan”), died Tuesday March 12 of a heart attack in the Bombay suburb of Bandra. He was 76 and had been ailing for some time.During a career that spanned 45 years, Hussain directed several musical melodramas that were huge hits while being the prototype Bollywood pic with lots of song-and-dance numbers, comedy and drama. He introduced nephew Khan in one of these “Qayamat se qayamat tak” (From Crisis to Crisis) pics. Producer-thesp Khan, who was in Hollywood to promote his Oscar-nominated pic “Lagaan,” rushed back to India upon hearing the news. In the 1960s and ’70s, Hussain’s pics filled Indian theaters — some of the biggest hits being “Tumsa nahin dekha” (No One Like You), “Teesri manzil” (The Third Floor), “Caravan,” and “Yaadon ki baraat” (Procession of Memories) — all with somewhat similar plots but great music from the top composers of the time. Hussain himself joked that he had come to Bombay in the 1950s with one script and reworking it over and over for 11 hits. Besides his nephew, Hussain is survived by his son director Mansoor Khan.