The chorus of this song is copied from the 1963 song 500 miles by Bobby Bare. The song was also covered by other artists including Peter, Paul and Mary. Yet another incidence of Bollywood copying song melodies. The movie is also based on the 1987 movie Someone to Watch Over Me.
So here it is, my rendition of the song:
Chords: tabs.ultimate-guitar.com/Lyrics:
Jab koi baat bigad jaye, jab koi mushkil pad jayeTum denaa saath meraa, o, humnavaazJab koi baat bigad jaye, jab koi mushkil pad jayeNaa koi hai, naa koi thaa, zindagi mein tumhaare sivaaTum denaa saath meraa, o, humnavaaz — (2)Ho chandani jab tak raat, detaa hai har koi saath,Tum magar andheron mein, naa chhodna mera haathHo chandani jab tak raat, detaa hai har koi saath,Tum magar andheron mein, naa chhodna mera haathJab koi baat bigad jaye, jab koi mushkil pad jayeTum denaa saath meraa, o, humnavaazNaa koi hai, naa koi thaa, zindagi mein tumhaare sivaaTum denaa saath meraa, o, humnavaazVafaadari ki vo rasamein nihayenge hum to kasame,Ek bhi saans zindagi ki, jab tak ho apane bas meinVafaadari ki vo rasmein nihayenge hum to kasame,Ek bhi saans zindagi ki, jab tak ho apane bas meinJab koi baat bigad jaye, jab koi mushkil pad jayeTum denaa saath meraa, o, humnavaazNaa koi hai, naa koi thaa, zindagi mein tumhaare sivaaTum denaa saath meraa, o, humnavaazDil ko mere hua yakin, hum pahale bhi mile kahinSilsila ye sadiyon ka, koi aaj ki baat nahinDil ko mere hua yakin, hum pahale bhi mile kahinSilsila ye sadiyon ka, koi aaj ki baat nahinJab koi baat bigad jaye, jab koi mushkil pad jayeTum denaa saath meraa, o, humnavaazJab koi baat bigad jaye, jab koi mushkil pad jayeTum denaa saath meraa, o, humnavaazNaa koi hai, naa koi thaa, zindagi mein tumhaare sivaaTum denaa saath meraa, o, humnavaazTum denaa saath meraa, o, humnavaaz
English Translation: http://www.bollymeaning.com/2012/07/jab-koi-baat-bigad-jaaye-lyrics.html
Thank you for listening
Peace
aG