We all don't know the reason, but Arijit Singh posted a public apology for Salman Khan on facebook. He wants the actor to include his song in Salman's next, Sultan.Arijit’s apology is quite heartfelt and proves that Singers totally need to maintain good relations with superstars if they are to survive in the industry. The only reason we could guess is that it all started in 2014, when Salman gave away the Best Singer (Male) award to Arijit at the Star Guild Awards in 2014. Let’s just say that the two didn’t hit the right note on stage together. Read the apology here.