Shyamal Mitra (14 January 1929 – 15 November 1987) was a Bengali singer, composer and producer. Along with Hemanta Mukherjee and Manna Dey, he was the most notable musician of the golden era of Bengali music industry. Beside recording a huge number of popular Bengali basic songs, he also worked as a playback singer in more than a hundred Bengali movies and directed music in more than fifty Bengali films.
https://en.wikipedia.org/wiki/Shyamal_Mitra