The song is Yakeen and it is from the album Doorie. Here is the complete song:
Aaj dil dukha hai
Tum yaad aaye ho
Anjaane log hain
Apne kahan dhoond paaye
Jaage hain soye nahin
Aisi hai meri yeh bechaini
Din bhi wohi, raatein wohi
Saanson mein saansein hain nahin
hmm hmmm
Shaamein ab dhalti nahin
Aanchal jo tera simat jaaye
Aap yahaan hamesha rahein
Doorie rahe na faasle
hmm hmmm
Jaage hain soye nahin
Aisi hai meri yeh bechaini
Din bhi wohi, raatein wohi
Saanson mein saansein hain nahin
hmm hmmm hmm hmmm
Ab agar tum mile toh
Itna yakeen hai
Hans denge hum toh
Rona nahin hai
You could find a video of Atif singing the song here:
http://myriadhues.wordpress.com/2007/02/05/yakeen-another-gem-by-atif-aslam/
Enjoy!
