Kishore's son Amit Kumar was already a popular singer in 1980s, thanks to patronage by R D Burman and Rajesh Roshan. But Kishore was still around, singing for established and young heroes alike. Kishore Kumar and Amitabh had some misunderstanding in mid-1980s. Kishore was producing a movie and Amitabh (who was a Bollywood deity by then) was supposed to do a guest-appearance in the movie. Amitabh arrived at the shoot, but left after few minutes, asking his secretary to tell Kishore that he wouldn't act in the movie. Kishore got upset and decided never to sing for Amitabh again. Incidentally, Amitabh's films started flopping after this and he faced the worst phase in his Bollywood career.