EXCLUSIVE: Here's what the mystery behind Sonu Nigam and Sachin Tendul

Sonu Nigam and Sachin Tendulkar are coming together. For a very special reason.

Recently, a picture of the two legends from their respective fields went viral on the Internet. But their coming together was kept a mystery for all the right reasons. Sonu and Sachin can be seen posing for the picture with their backs facing the camera.

While Sachin has the microphone, Sonu held a bat in his hands. But we EXLUSIVELY 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."