With respect to all those who have tabbed this song in the past in the key of Fm,
this is actually closer to the real thing. Originally it was recorded in a kind of
G, before the whole mix was 
sped up one semitone to G# to make the vocals sound 'younger and more innocent'.
However, the song only really works in the key described below which is, to all
intents and purposes, G.

(A note on how the chords are formed)

When played on the piano, the opening chord is constructed of an Em7 with a G bass,
followed by a Dm7 with a C bass. Towards the end of the verse there is more of this
trickery, involving a Gm7 with a C bass and an FM7 also with a C bass. The G9 in the
bridge can be played as a G7, a G6 or a G13, 
depending on how you play and what your ear tells you.

What I've called Em7/G is similar to the open G shape, the notes being G, (A muted), E, G, D, E. 

What I've done below is the best I can for a song that was designed for piano and not guitar.

Verse 1:
	
	Em7/G           Dm7/C  
	Where  did your long hair go
	Em7/G                Dm7/C  
	Where  is the girl I used to know
	Em7/G           Gm7       Gm7/C FM7/C
	How   could you lose that happy glow
	             FM7
	Oh Caroline, No

Verse 2:
	
	Who took that look away
	I remember how you used to say
	You'd never change, but that's not true
	Oh Caroline, you

Bridge:
	
	        Dm7  G9   CM7
	Break my heart, I want to and cry
	       E7sus4b9   E7      Am7
	It's so sad to watch a sweet thing die
	             Fm6
	Oh Caroline, why

Verse 3:
	
	Could I ever find in you again
	Things that made me love you so much then
	Could we ever bring them back once they had gone
	Oh Caroline, no
	
[repeat verse chords to fade]