I've listened to the CD and this is in the correct key.
These chords are the ones used in the piano part and are all played in their
root position from the octave below middle C. The main riff is based around
the Fm pentatonic scale and starts on an Ab, if you understand that! This is
basically a piano/keyboard tab and doesnt work as well on guitar, but try it
anyway!
Intro:
Fm Bb Fm Bb
Fm Ab
All around me are familiar faces
Eb Bb
Worn out places – worn out faces
Fm Ab
Bright and early for their daily races
Eb Bb
Going nowhere – going nowhere
Fm Ab
Their tears are filling up their glasses
Eb Bb
No expression – no expression
Fm Ab
Hide my head I want to drown my sorrow
Eb Bb
No tomorrow – no tomorrow
[ Tab from: https://www.guitartabs.cc/tabs/g/gary_jules/mad_world_crd_ver_4.html ]
Fm Bb Fm
And I find it kinda funny, I find it kinda sad
Fm Bb Fm
The dreams in which I’m dying are the best I’ve ever had
Fm Bb Fm
I find it hard to tell you, I find it hard to take
Fm Bb
When people run in circles it’s a very very
Fm Bb
Maaaaaad world
Fm Bb
Maaaaaaad world
Fm Ab
Children waiting for the day they feel good
Eb Bb
Happy birthday – happy birthday
Fm Ab
Made to feel the way that every child should
Eb Bb
Sit and listen – sit and listen
Fm Ab
Went to school and I was very nervous
Eb Bb
No one knew me – no one knew me
Fm Ab
Hello teacher tell me what’s my lesson
Eb Bb
Look right through me – look right through me
Fm Bb Fm
And I find it kinda funny, I find it kinda sad
Fm Bb Fm
The dreams in which I’m dying are the best I’ve ever had
F Bb Fm
I find it hard to tell you, I find it hard to take
Fm Bb
When people run in circles it’s a very very
Fm Bb
Maaaaaad world
Fm Bb
Enlarge your world
Fm Bb
Mad world