I think u r talking about Bappa Mazumdar. He started wth the band name Dolchut wth Sanjib Chottopadhdhay. Now he's releasing solo/duet albums. Here are the albums released by him ...
Dalchhut 1. Ahh!
2. Hridoypur
3. Aakash Churi
Solo 1. Tokhono Vorbela
2. Kothao Keu Nei
3. Rater Train
4. Dhulo Pora Chitti
5. Raat Prohoree
6. Moner Ghuri (coming soon)
Duet Ichche Korei Ekshathe (Bappa + Anjan Datta) [5 of 10 by Bappa]
Bhalobashar Din (Bappa + Shahin + Niloy) [3 of 10 by Bappa]
Du Poshla Brishti (Bappa + Indrani) [5 of 10 by Bappa]
Eki Shohore (Bappa + Jewel) [5 of 12 by Bappa]
Chele Manushi (Bappa + Agun)
Rongmela 2 (Mixed Album) [only 1 song by Bappa]
And here's a link
http://www.bappa-mazumder.com/ U can undoubtedly buy the 3 albums released by Dolchut if u like Bappa's style. And about the solos I didnt listen most of them.
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The song "Eto Koshto Keno Bhalobashay" is by Hasan. Cant remember the title or album.
Happy shopping ... and when buy the albums dont forget to share wth ur fellow BT members :D