Delhi Chief Minister Arvind Kejriwal capped his speech at his oath-taking ceremony here Saturday by singing a few lines of a song of brotherhood - the same Manna Dey song which the AAP leader sang at the Ramlila Maidan in 2013."Insaan se insaan ka ho bhaichara, yehi hai paigam hamara (People should have brotherly relations, this is our message)," he sang to loud cheers."Har ek mahal se kaho ke/ Jhopdiyo me diye jalaye/ Chhoto aur bado me ab/ Koi phark nahi rah jaye. (Every palace should light up lamps in huts, and there should be no differences between rich and poor)."The revolutionary song, sung by Manna Dey and penned by Pradeep, is from an old Bollywood film, "Paigham".When Kejriwal sang a song during his oath-taking ceremony in 2013, he broke convention as it was quite unlike what any chief minister has done in India until then.On Saturday, he once again struck a chord with the 'aam aadmi' by singing the song.