As a social reformer Guru Nanak Sahib upheld the cause of women, downtrodden and the poors. He attacked the citadel of caste system of Hindus and theocracy of Muslim rulers. He was a born poet. He wrote 974 hyms comprising Japji Sahib, Asa-Di-Var, Bara-Mah, Sidh-Gosht, Onkar (Dakhani) and these were included in Guru Granth Sahib by Guru Arjan Sahib. He was also a perfect musician. He with the company of Bhai Mardana compsed such tunes in various Indian classical Ragas that charmed and tawed wild creatures like Babar, subdued saging kings, raved bigots and tyrants, made thugs and robbers saints. He was a reformer as well as a revolutionary. God had endowed him with a contemplative mind and pious disposition. Guru Arjan Sahib called him “the image of God, nay, God Himself”.