https://www.youtube.com/watch?v=oS-0jES79d8 A composition rendered by independent artist Ronkini Gupta in new Bollywood film 'Tumhari Sulu' (Yours Sulu) is being rated as one of "finest pieces" heard this year. That may not be an overestimation, considering Bollywood's contemporary repertoire is mostly cacophony masquerading as music. "Rafu" (which means darning) has been composed by indie musician Santanu Ghatak,…