Being under contract with United Producers, he got projects such as Aurat, Doli and Ittefaq. He was then noticed for his performances in films such as Baharon Ke Sapne, Aurat (1967), Doli, Aradhana and Ittefaq. In Bahraon Ke Sapne, the response from the public in the first week of run forced the film's ending to be changed from a tragic one to a happier one from the second week. Later, Waheeda Rehman suggested to Asit Sen to take Khanna for the lead role in Khamoshi. Through Aradhana he rose to "instant national fame" and film critics referred to him as the first superstar of India. Rajesh Khanna was cast in a double role (father and son) opposite Sharmila Tagore and Farida Jalal. It also saw the resurgence of Kishore Kumar, who eventually became the official playback voice of Rajesh Khanna. They worked together until Kishore's death in 1987 and songs of their combination were released until 1991.