“His works in these years led Islamic devotional songs into the mainstream of Bengali folk music, exploring the Islamic practices of namaz (prayer), roza (fasting), hajj (pilgrimage) and zakat (charity). This was regarded by his contemporaries as a significant achievement as Bengali Muslims had been strongly averse to devotional music. Nazrul’s creativity diversified as he explored Hindu devotional music by composing Shama Sangeet, bhajans and kirtans, often merging Islamic and Hindu values. Nazrul’s poetry and songs explored the philosophy of Islam and Hinduism .”
In 1920, Nazrul expressed his vision of religious harmony in an editorial in Yuga Bani,
Come brother Hindu! Come Musalman! Come Buddhist! Come Christian! Let us transcend all barriers, let us foresake forever all smallness, all lies, all selfishness and let us call brothers as brothers. We shall quarrel no more.
For more on the life of Nazrul Islam go here.