Bhumika
A talented girl from a poor family becomes a successful singer and actress. Being married and having a girl, she has an affair with her co-star, producer and a wealthy married man who has a son.
Starring Smita Patil, Anant Nag, Naseeruddin Shah, Amrish Puri, Amol Palekar, Kalbhushan Karbanda, Sulabha Deshpande, Baby Rukshana, B.V. Karanth, Dina Pathak
Watch "Bhumika" on Mubi released in 1977. It's a drama movie, and has a rating of 7.4 out of 10 from Imdb which is usually fine for this kind of movie.