The song starts with the piano motif, the 'answer' is Bb-F 

|Fm Ab7|Gm C7|Fm Ab7|Gm C7|
|Fm Ab7|Gm C7|(1)|Fm Ab7|Gm C7|
             |(2)|Fm Gm|Abo7 Am|
Bridge
|Bbm7 Ab7|G7 C7|Fm  |F7b9 |

|Bbm Ab7|G7   |C7    |  %  |
|Fm  Ab7|Gm C7|Fm Ab7|Gm C7|
|Fm  Ab7|Gm C7|Fm Ab7|Gm C7|