Amitabh Bachchan and Rekha starred bollywood movie ‘Alaap’ is a musical drama movie which was directed by Hrishikesh Mukherjee. The movie was released in 1977 under the banner of Rupam Chitra. Other starcast included Chhaya Devi, G. Asrani, Manmohan Krishna, Lily Chakravarty, Farida Jalal, Om Prakash, Yunus Parvez, Vijay Sharma, Benjamin Gilani, Lalita Kumari etc in important roles. The movie was produced by N.C. Sippy and Hrishikesh Mukherjee whereas screenplay and dialogues were written by Bimal Dutta and Dr. Rahi Masoom Reza respectively. The music was directed by Jaidev and list of playback singers included G. Asrani, Dilraj Kaur, Lata Mangeshkar, Bhupendra Singh, K.J. Yesudas, Madhurani etc. Hit songs of the movie are listed below:

1. Chand Akela
2. Koi Gata Main So Jata
3. Zindagi Ko Sanwarna Hoga

Movie starts with Triloki Prasad (Om Prakash) who is an advocate lives a wealthy lifestyle in a small town with his two sons named Ashok Prasad (Vijay Sharma) who is also an advocate and is married to Geeta (Lily Chakravarty) and his second son named Alok Prasad (Amitabh Bachchan) who has yet to settle down in their law firm. Alok loves music and therefore he has also joined the classes run by Pandit Jamuna Prasad (A.K. Hangal). One day when Alok returns from the classes, his father asks him to assist his brother to their law firm and start learning to practice. He agrees to do so. After sometime his father comes to know that he has not been at the firm but is instead spending time in the local slums with a former courtesan named Sarju Bai Banaraswali (Chhaya Devi).

Triloki warns Alok to leave her but continues to visit Sarju Bai. One day Mr. Gupta (Yunus Parvez) approaches Triloki about taking possession and demolishing the slum area. Triloki agrees quickly and manages to sway the Court’s decision in Gupta’s favor and in return he gets a huge amount from him. As a result many people become homeless. Triloki asks Alok to buy a second hand car from the money of Mr. Gupta. He takes the money and buys a horse-carriage and decides to drive it himself to make a living which engrages Triloki. He orders him to leave the house. Later he decides to hire motor coaches to transport people at a much cheaper price when he observes that Alok is doing well in his business. He thinks that this move will perhaps forcing him to reconsider his decision, apologize, and return home.