For the title track of Chhapaak, based on the harrowing true story of an acid attack survivor, soothing strains of flute and oud contrast Arijit Singh’s haunting vocals; layered with Gulzar’s heart-wrenching lyrics, which give weight to the emotional impact of a life-changing event. Singh delivers the uplifting “Khulne Do” while Siddharth Mahadevan lightens the mood further on “Nok Jhok”, channelling his father in this acoustic story of a budding romance.