Listen to Ek Din Kahin Hum Do online. Ek Din Kahin Hum Do is a Hindi language song and is sung by Nusrat Fateh Ali Khan and Sonu Nigam. Ek Din Kahin Hum Do, from the album Classic Love Songs - Vol. 1, was released in the year 2012. The duration of the song is 7:04. Download Hindi songs online from JioSaavn.