Karan Johar is going to be the chief guest in the "Karan Johar Special" episode in "Indian Idol 12". Talking about recording the title track with Lata Mangeshkar, Karan gets nostalgic and shares: "I still remember when Lata ji had come to sing the title track of `Kabhi Khushi Kabhie Gham`. There were four versions of the song, one main version and three to four sad versions that play throughout the film. So, our plan was that Lata ji would come and sing the main track and then come another day and sing the other versions.

"I cannot tell you how Lata ji sang all the songs in one day, one after the other. I feel goosebumps even today when I think about that day when I was sitting in front of Lata Mangeshkar ji and she was rehearsing with Jatin-Lalit. And they said `didi, we`ll do the other versions tomorrow` and she asked why?, we`ll sing it today only."