Bon Jovi - Knocking On Heavens Door Chords

Knocking on Heaven's Door

There are probably 100 covers for this song but my favourite 
is the one that richie and Jon did live at one of their concerts. 

It just goes:

G, D, Am, Am
standard tuning
Just listen to the strummming pattern because it varies per version 
although the chords are basically the same
 
Here's the words:

Mama take this badge from me
I can't use it anymore 
It's getting dark too dark to see 
Feels like I'm knockin' on heaven's door 

Knock-knock-knockin' on heaven's door x4 

Mama put my guns in the ground 
I can't shoot them anymore 
That cold black cloud is comin' down 
Feels like I'm knockin' on heaven's door 

Knock-knock-knockin' on heaven's door 

OOooo OOooo OOOoo
 etc