When it came to a particular song situation, Anurag wanted Hrithik to lend his own vocals to a song in English. Hrithik was taken aback with Anurag's suggestion. However, when his director told him that the song situation would look more authentic if he did his own playback the actor agreed. But that was just the first step. Obviously, he was nervous and had to prepare. Says producer Rakesh Roshan, "When we came up with this song Anurag suggested that Hrithik and Barbara should sing it. I wasn't sure whether Hrithik would agree even though he is a good singer. When Hrithik heard the song he immediately agreed and started rehearsing, but Barbara was not available so we found a singer Suzanne to sing the song. Barbara heard the song later and loved it. Suzanne came back to the recording studio when Barbara was around and in Barbara's presence, Suzanne did the Spanish portions again so that she got the pronunciations perfect."
Rakesh recalls how Hrithik started recording his song at midnight and finished by 4 am. Says the proud dad, "When Duggu does something new he always put his best foot forward. All of us at home are very proud of him, because he has done such a commendable job."
Adding his personal touch to the story, Hrithik says, "I was forced to sing. My uncle Rajesh Roshan (the music director of Kites) came up with this tune and Anurag had this ridiculous notion that I could sing. Anurag's logic was — here's a guy who can act and dance well. And, since he knew that I have some knowledge of music, he just felt that I could sing my own song as well." Anurag says, "Having Hrithik sing is the bonus feature."
Hrithik started with waking up each morning and learning from the scratch. Says the superstar, "I started early in the morning with my sa re ga ma pa dha ni sa.
Right from the time I woke up, even when brushing my teeth, while taking a shower I would keep singing sa re ga ma and would raise my hands to reach the highest scale and lowest note. My niece had learned the piano and she had a little Casio player, which I then borrowed. I finally got myself a professional trainer Suzanne who did the female portions in the song. When the actual recording was to be done, I got them to switch off all the lights in the studio because I wasn't being able to get my best out. Only when the whole studio was blacked out did every note fall perfectly into place. Actually we first made the scratch and I thought I would record a final track again. But everyone just loved the scratch and they did not allow me to improvise on it."
http://timesofindia.indiatimes.com/entertainment/bollywood/news-interviews/Hrithik-orders-a-blackout/articleshow/5718946.cms
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