To find these, use the exact search string: "Kumar Sanu" + "rare Bengali + FLAC/MP3 download" on legal archival sites like (only public domain or officially uploaded content).
Note: Exact Bengali titles and spellings vary across releases and transliterations; the list above is a representative guide to the types of songs Kumar Sanu sang in Bengali rather than a definitive discography. kumar sanu bengali mp3 song download a to z best