Show me scales that sound good with the chords in this song: G,Em,C,Am.

#----------------------------PLEASE NOTE-----------------------------#
# This represents the author's own work and interpretation of the    #
# song. To be used only for private study, scholarship, or research. #
#--------------------------------------------------------------------#

Artist: The Decemberists
 Album: The Hazards Of Love
  Song: The Rake's Song

[http://www.indieguitartabs.com/bands/decemberists/the_rakes_song.html]

Tabbed by: Jacob Stern

Listen to the song to get the timing and strum pattern right.
You can download it free from The Decemberists website. Have fun
This song is evil! 

Intro: G Em G Em Gm...

G        Em     G       Em
I had entered into a marriage
In the summer of my twenty-first year
And the bells rang for our wedding
Only now do I remember it clear
   Am         C           G Em... 
Alright, alright, alright

G         Em       G        Em
No more a rake and no more a bachelor
I was wedded and it whetted my thirst
Until her womb start spilling out babies
Only then did I reckon my curse
    Am        C          G Em...
Alright, alright, alright
Alright, alright, alright
G          Em         G                    Em
First came Eziah with his crinkled little fingers
Then came Charlotte and that wretched girl Dawn
Ugly Myfanwy died on delivery
Mercifully taking her mother along
    Am        C          G Em...
Alright, alright, alright

G           Em         G        Em
What can one do when one is widower
Shamefully saddled with three little pests
All that I wanted was the freedom of a new life
So my burden I began to divest
    Am        C           G Em...
Alright, alright, alright
Alright, alright, alright

G           Em            G          Em
Charlotte I buried after feeding her foxglove
Dawn was easy, she was drowned in the bath
Eziah fought but was easily bested
Burned his body for incurring my wrath
    Am        C          G Em...
Alright, alright, alright

G                Em        G          Em
And that's how I came your humble narrator
To be living so easy and free
Expect you think that I should be haunted
But it never really bothers me
    Am        C          G Em...
Alright, alright, alright
Alright, alright, alright

 Ending: G Em Em