New Delhi, March 7 -- Until my colleague Uday Bhatia sent me a list of lesser hits and insisted I listen to them, I'd found Arijit Singh somewhat formulaic, too much guitar, too much weepy heartbreak. There's no doubt that Arijit is a superstar of the music world, his giant hits, sold-out concerts, streaming numbers and collaborations are plenty of proof, and the sad songs are certainly soulful, but Hindi cinema seems to provide few challenges to a singer with Arijit's artistic range. Songs like the complex Binte Dil (Padmaavat) or the poetic Gulon Mein Rang Bhare (Haider), which take Arijit out of melodic moodiness and demonstrate his arc, are rare in his repertoire. I can almost understand why Arijit retired from playback singing at the...