Create a music poster using the provided image. At the top of the image, add the text 'Sourav Sarkar Music Presents' in a clean, modern English font. In a prominent position, add the song title 'একাই আছি একাই থাকবো' using a beautiful and stylish Bengali font. At the bottom of the image, add the credits in a smaller, legible English font: 'Singer - Sourav Sarkar, Lyricist - Lokman Hossain, Music & Arrangements - Sourav Sarkar'. Ensure all text is clearly readable against the background and the overall design looks professional, maintaining the 16:9 aspect ratio.
