So there are like 4 basic chords for this song.

C, Am, Dm, F..

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

                        C (x32010@1)Zaara naazar uthake dekho
                  AmBaithe (x02210@1)hai hum yahi
                     DmBekhabar (xx0231@1)mujhse kyon ho?
                      CItne (x32010@1)boore bhi hum nahin

                          CZamane (x32010@1)ki baaton mein uljho na
                    AmHai (x02210@1)yeh aasaan janana
                       DmKhud (xx0231@1)se jo agar tum poocho$
                    CHai (x32010@1)hum tumhare ke nahi

                    F (133211@1)                 
Teri aankhon ka jaadu
                  G (320003@1)              
Poori duniya pe hai
                   CDuniya (x32010@1)ki iss bheed main
                   AmSabse (x02210@1)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