"I have seen the talent (contestants) on the show, I must say they are amazing. My mind was blown away when I saw people from abroad singing Indian songs. I was impressed," he said.
Karan reveals he was once advised by his mother not to sing in school competition.
"There was a talent parade in my school. I was eight years old and I used to understand music, Sur, but my mother had told me that I should either recite a poem or give a speech but don't sing. I thought singing English song will be good idea but I was asked to leave. I have knowledge of music but I can't sing," he added.
The 44-year-old filmmaker is a fan of late Mohammed Rafi.
"I like all Mohammed Rafi songs, there is melody, romance, sweetness and sadness. I like Asha Bhosale's rendition of 'Lag Jaa Gale', it's my most favourite song, I listen to it all the time," he adds.
"I hope people will sing songs from the past. Right from 40s to 70s the music was phenomenal. We had Madan Mohan, S D Burman, R D Burman, Shankar Jaikishen...We had amazing people. I don't think we can compete with those melodies. I hope contestants will take us down memory lane."
Karan has been judging a dance reality show and talent reality show as well. "I am judging for six years, I can do PhD in judging," he said jokingly.