Great Song. I grew up loving it and it's super fun to play.
I play it with mostly bar chords to give it some flavor. Go ahead and 
throw in some hammer-ons and pull-offs and make it fun.
Perfect example how you can use key changes and simple progressions 
to make clever songs that are also catchy.
Also an example of how they just don't make 'em like they used to;)
Enjoy!







OMD
If You Leave
Standard tuning


Intro:
F Dm Bb C (repeat)
D D  A  G  A 




Verse 1:(Key of F)




F              Dm        
If you leave, don't leave now
Bb                     C
Please don't take my heart away
F                Dm
Promise me just one more night
Am                    Bb 
Then we'll go our separate ways
F                     Dm
With hours left time on our sides
Bb               C
Now it's fading fast
F                 Dm
Every second every moment
Bb                         C
We've got to--we've gotta make it last




Chorus 1: (Key change to D)



D                    D
I touch you once I touch you twice
A                   G  A
I won't let go at any price
   D                     D
I need you now like I needed you then
      A                        G     A    D      G
You always said we'd still be friends someday





Verse 2: (Key change to G)


G             Em
If you leave I won't cry
C                D
I won't waste one single day
G                   Em
But if you leave don't look back
Bm                 C
I'll be running the other way
G                 Em
Seven years went under the bridge
C                      D
Like time was standing still
G                 Em
Heaven knows what happens now
C                           D
You've got to--you've gotta say you will





Chorus 2:


E                   E
I touch you once I touch you twice
B                  A    B
I won't let go at any price
E                     E
I need you now like I needed you then
      B                A                           
You always said we'd meet again




Sax solo in E....





Chorus 3: (Key change to D)
D                   D
I touch you once I touch you twice
A                G         A
I won't let go at any price
D                     D
I need you now like I needed you then
    A                    G                           
You always said we'd still be friends




Chorus 4: (Key change to E)

E                   E
I touch you once I touch you twice
B                  A       B
I won't let go at any price
E                     E
I need you now like I needed you then
    B                A               E      A
You always said we'd meet again some day




Break: (Key change to F)

F, F, Gm, C




Outro: (Key change G)



G           G       Am        D
If you leave
G           G       Am        D
Oh if you leave

G           G       Am        D
Oh if you leave
G           G       Am        D
Don't look back
G           G       Am        D
Don't look back................