Here’s what I came up with for the song 
Knocking on Heaven’s door
 by Bob Dylan       

Chords
        G     D            Am7          C

 E   --3--	-2--     	-0--	-0---
 B   --0--	-3--	-1--	-1---
 G   --0--	-2--	-0--	-0---
 D   --0--	-0--	-2--	-2---
 A   --2--	-x--	-0--	-3---
 E   --3--	-x--	-x--	-x---


Intro   G  D  Am7

Verse    

G                         D            Am7
Mamma…

G                         D             Am7
I can’t...

G		     D	        Am7
It’s getting….

G		     D             Am7
I feel I’m…

Chorus  

G	D                       C
Knock, knock, knocking on heavens door

G	D	           C
Knock, knock, knocking on heavens door

G	D		C
Knock, knock, knocking on heavens door

G	  D	           C
Knock, knock, knocking on heavens door


It’s the basic way to play it, and it sounds pretty good to me.
This song is really good for beginners or easy players 
who want to have fun singing a song.
Get your guitar out, invite some friends and have fun.