'No original composer for Jhumka Gira Re'

The latest song What Jhumka? from Rocky Aur Rani Kii Prem Kahaani has become a sensation on social media. Composed by Pritam, written by Amitabh Bhattacharya, and sung by Arijit Singh, the song has been credited to Madan Mohan and Raja Mehdi Ali Khan by the makers, but it is actually a part of folk tradition with no original composer or writer.