[1] Nazrul wrote and composed nearly 4,000 songs (including gramophone records),[2] which are widely popular in Bangladesh and India.

Following Kazi Bazle Karim, his uncle and a leader of a Leto group, he became an expert in composing songs and setting them to tunes.

He learned a great deal of Persian language, literature, and music with the help of a religious teacher from Punjab attached with the regiment.

The mass music and poems of Kazi Nazrul Islam have been widely used during the Indian Independence Movement and Bangladesh Liberation War.

Among the revolutionary songs, Karar Oi Louho Kopat (Prison-doors of Steel) is best known and has been used in several movies, especially those made during the pre-independence period of Bangladesh.