While Sachin has the microphone, Sonu held a bat in his hands. But we EXCLUSIVELY reveal what the whole mystery is about.
Our source told us, "Sonu has sung the Sachin anthem which will be used in the Tendulkar biopic that is in news. Sachin plays himself in the biographical documentary - the teaser of which will be released soon. Sachin is considered the biggest Indian cricketing legend and that's why the film needed an anthem, which Sonu has lent his voice to."
So there you go!