The whole soundtrack is awesome. One can't pick one song as the best. Personally, I love Bandya, Janie Janie, Hamaray Hain and Khuda Ke Liye.
The soundtrack of Khuda Kay Liye is rich in melody.
Music by Rohail Hyatt
Vocals: Ahmad Jahanzeb, Shuja Haider, Farah Zala, Ammar Hassan, Khawar Jawad, Faiza Mujahid, Saeen Zahoor, Zara Madani and Hadiqa Kiyani
Lyrics: Shoaib Mansoor, Buley Shah, Faiza Mujahid
Compositions: Ahmad Jahanzeb, Shuja Haider, Lagan The Band, Khawar Jawad, Javed Bashir, Kamijee
Songs
1. Bandya
2. Hamaray Hain
3. Dunya Ho
4. Tiluk Kamod
5. Khuda Kay Liye
6. Janie Janie
7. Bandya
8. Allah Hoo
9. Mahi Way
10. Instrumental