The former was a phrase out of the song Uthe sab ke qadam in the film Baaton Baaton Mein while Kabhi alvidaa na kehna was a line from Amit Khanna's song Chalte chalte mere yeh geet yaad rakhna in the film Chalte Chalte."
Interestingly Dilwale Dulhaniya Le Jayenge which was the title of Karan's pal Aditya's mega-moneyspinner was also a popular line from chartbuster from the film Chor Machaye Shor.
Recalls Karan, "We went through hell trying to get a title song. Jatin-Lalit composed a title song for Adi's DDLJ they came up with several tunes.
The tune that was finally selected as DDLJ's title track finally surfaced in the Salman-starrer Jab Pyar Kissise Hota Hai as Hum tumko bhagakar le jayenge.
There was finally no title song in DDLJ. I guess I was luckier. I was able to get title songs for both my films although they were part of very successful songs in the past."
Karan is very proud of the music in KANK. "Anyone who has ever been lost in love will love the tracks specially the title track and Mitwa."