In a bridge across a sea, saxophone music is heard which is played by Guna. He recollects about the tragedy which happened two years back in his life. Guna and Siva are two brothers who own an orchestra and are very popular with their performances. Both are very affectionate towards each other. Both of them look for their love and eventually find one. The girl whom Siva chose accepted his love, while the girl chose by Guna insults him of his fat size, which hurts him. Siva's love fails, and he is heartbroken. To console him, Guna shifts to city with Siva and his sister Seema. Guna's father had an illegal affair with a woman named Sitamma during their childhood, and on his deathbed, his father gets a promise from Guna that he should accommodate her with them as she does not have any relation. Guna, who lost his mother, invites her to live with them. Sitamma accepts on the condition that nobody in the family should know how she is related to them and also she should be introduced as a cook. Unwillingly, Guna accepts that. Guna as a saxophone player, music director, and lyricist and Siva as a singer both flourish in their career. Sitamma finds that Guna is a very affectionate person and Siva is a very sensitive person who cannot bear any downfalls in life even to a little extent. Next to Guna's home is the house of film choreographer Anjali, a very beautiful woman. Both Guna and Siva see her separately and fall in love. Siva approaches her directly and impresses her. Anjali hears saxophone music and misunderstands that it is Siva who is playing it. She gets attracted to him for that reason. Siva also lies to her that all his brother's talents are his talents. Guna, who has got a complex about his fat size, decides to begin a friendship to Anjali's father and gradually to her, not knowing that she already loves Siva. Anjali responds to his indirect approach, thinking that it is done by Siva, but Guna is very happy that she loves him. Film superstar Sirpy also gets attracted to Anjali and behaves very closely to her, which irritates possessive Siva. This creates a fight between the two. Sitamma finds about the misunderstanding among Guna, Anjali, and Siva and tells Guna about the love affair between them, which shocks Guna. She convinces Guna to drop his love for her as Siva cannot tolerate any defeat in his life, to which Guna does not accept it. Anjali gets confused when Guna confesses his love for her. Anjali also comes to know that Siva has lied to her about his saxophone and poem writing talent and gets furious on him. She asks him to drop the love as she does not want be the reason for the heat between two brothers. Siva decides that he will not accept anyone between them even if it happens to be his own brother. Sirpy compels Anjali to marry him, and she refuses to it. On anger, he gives a fake statement to press that both himself and Anjali are in love and planned to get married shortly. Guna gets furious that Anjali cheated both him and his brother, but Anjali explains that she is not responsible. Anjali's father assures Anjali that Guna is right for her as she got attracted only to his talents and eventually her love should be for him. Sirpy provokes the heat between Guna and Siva and because of which Siva insults his brother and Sitamma, resulting in Sitamma's demise. Sirpy kidnaps Anjali to marry her. Unable to save Anjali, Siva comes back to his family, pleading to save her. Guna fights with Sirpy and rescues Anjali. However, Sirpy threatens Guna with Siva on the top of the hill. Siva pulls Sirpy, jumps from the hilltop, and dies with him. Back to the present, it was the day when Siva died on the same place where Guna is playing saxophone on his memory. Anjali's father convinces Guna about Anjali and requests him to marry her or he will kill her by his hands as he could not tolerate her sufferings. Guna and Anjali finally unite.
The film is based on the 1990 French film Cyrano de Bergerac, which itself was based on the 1897 play of the same name by Edmond Rostand, which was about a swashbuckler who is self-conscious about his long nose and feels his love will go unrequited. When the girl he loves gets infatuated with a dasher, he helps him by pouring his emotions in poems soaked in love. In Duet, the hero's ungainly nose was replaced by his girth. This was the first film of actor Prakash Raj in Tamil as the antagonist. In remembrance, he named his production houseDuet Movies. Saran was one of the assistant directors in the film.
Soundtrack
The soundtrack was composed by A. R. Rahman and lyrics were written by Vairamuthu. The soundtrack features eight songs, three recitals and three instrumental pieces. The saxophonic instrumentation was done by Kadri Gopalnath and Raju. Gopalnath reached public fame after this album. He once told about this album, "I played some 30 ragas for Rahman. He wasn't satisfied. Finally I played Kalyana Vasantam, and he said, "That's it!"". The song "Mettu Podu" is set in the ragaAnandabhairavi, and "Anjali Anjali" is set in Maand.
Tamil version
Telugu version
All the lyrics were penned by Vennelakanti. As per that existing trend in Telugu film industry Rahman used the common voices of all the films, S. P. Balasubrahmanyam & K. S. Chithra, for all the songs.
Hindi version
All the lyrics were penned by P.K. Mishra.
Reception
K. Vijiyin of New Straits Times wrote, "It is a simple story but Balachander's screenplay and handling of the cast make it memorable". The film failed commercially.
