Lukka Chuppi from Rang de Basanti, sung by Lata Mangeshkar and A. R. Rahman, composed by Rahman, written by Prasoon Joshi. Great music, great singing, great lyrics. It’s a conversation between a mother and her late son, the mother, unable to accept the tragedy, calling for him to return from playing hide and seek; the son, freed from earthly shackles, soaring in his newfound freedom.