Hi.I'd like to share with you Smiley's "Dream Girl". The whole song contents of 4 
chords. Good Luck! :)
Intro: Am, G, Em, F

Am                 G
I?m sitting alone drinking alcohol
Em             F
I?m Writing a song about you
Am                   G
I know it?s so sad, maybe even mad
Em                       F
But I know what you?re doing behind my back

and it goes on and on 'till the end. Hope you liked it :)