You could even say this is the whole song, not only the intro, but I'm not sure. 
There is probably a bass line playing on D, A and E. But.. well. Meh. Nice and melodic

                 Am                    Am/G
E||----------------------------|-----------------------------|
B||-----------------1----------|-----------0-----------------|
G||-------2-----------------2--|------------------0----------|
D||------------2---------------|-----2------------------0----|
A||--0-------------------------|-----------------------------|
E||----------------------------|-----------------------------|

                G                             Dm
  |----------------------------|------------1----------------|
  |--0-----------------0-------|--3-----------------3-----3--|
  |--------0-------------------|-------2---------------2-----|
  |--------------0--------0----|-----------------------------|
  |----------------------------|-----------------------------|
  |----------------------------|-----------------------------|
  
               Am
  |----------------------------|-------------|
  |-----------------1----------|-------------|
  |-------2-----------------2--|--------2----|
  |------------2---------------|-----2-------|
  |--0-------------------------|-------------|
  |----------------------------|-------------|
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