So there are like 4 basic chords for this song.

C, Am, Dm, F..

Starts with the whistling...C,Am,Dm,C

                        C 
Zaara naazar uthake dekho
                  Am
Baithe hai hum yahi
                     Dm
Bekhabar mujhse kyon ho?
                      C
Itne boore bhi hum nahin

                          C
Zamane ki baaton mein uljho na
                    Am
Hai yeh aasaan janana
                       Dm
Khud se jo agar tum poocho$
                    C
Hai hum tumhare ke nahi

                    F                   
Teri aankhon ka jaadu
                  G                
Poori duniya pe hai
                   C
Duniya ki iss bheed main
                   Am
Sabse peeche hum khade

Repeat the same chords for the whole song..:)

Mehfile aayi aur gayi
Log aaye aur gaye
Tum jo aaj aaye ho
Dil mein ho bas gaye

Muskurake baat taalo na
Phir miloge jo kahin
Dekhana yahi kahoge
Itne boore the hum nahi

Teri aankhon ka jaadu
poori duniya pe hai
Duniya ki is bheed mein
sabse peeche hum khade