"Initially, I did not know 'Ae mere watan ke logon' will become so popular," she said at a function organised to mark the 51st anniversary of her famous song at the Mahalaxmi Racecourse here this evening.
Narendra Modi, BJP's prime ministerial candidate, was also present at the occasion, where Mangeshkar sung first few lines of the song.
The song, composed by C Ramachandra, was written by Kavi Pradeep in honour of Indian soldiers who lost their lives in the 1962 war with China.
Recounting the events before she performed in Delhi, the Bharat Ratna awardee said one day she received a phone call from Kavi Pradeep, who said he has written a song and wanted her to give a voice to it.
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Mangeshkar told Kavi Pradeep she was not prepared to sing the song at such a short notice. However, Pradeep insisted, saying "main chahta huin tum he yeh gana gaho."
She then went to Ramachandra for rehearsal. However, since Ramachandra was in a hurry to leave for Delhi, she could rehearse the song only once. But she kept listening to the recorded song.
"Lata, tumne aaj mujhe rula diya," she said quoting the Prime Minister.
Nehru was very sad over the India-China war and he looked downcast, Mangeshkar said.
Later, Indira Gandhi and her sons Rajeev and Sanjay came to see Mangeshkar and they clicked photos with her.
"I have done over 100 shows abroad and every time I have sung this song. People always request me to sing "Ae mere watan ke logon."