Explanation:

As an Ode to Mother Bengal, it was written by Bengali polymath Rabindranath Tagore in 1905.The song was written during the Swadeshi movement, when the ruling British Empire had an undivided India's province of Bengal split into two parts.The word sonar literally means 'made of gold' or 'beloved', but in the song sonar Bangla may be interpreted to either express the preciousness of Bengal or refer to the colour of paddy fields before harvest.Considering the importance of the song in the liberation struggle of Bangladesh and the contribution of Rabindranath Tagore, it was made the National Anthem of Bangladesh.