Song: Peg O' My Heart
Album: Going Out in Style (March 1st, 2011)
Artist: Dropkick Murphys
Writers: Alfred Bryan and Fred Fisher

Intro: x2 (Listen for the rhythm. These are just the notes)
G------------------|------------------|-----------------|
D----------3-3-3-3-|------------------|---------3-3-3-3-|
A--3-3-3-3---------|-3-3-3-3----------|-3-3-3-3---------|
E------------------|---------3-3-3-3--|-----------------|

G---------------------------------------------|
D---------------------------------------------|
A---------------------------------------------|
E--2/3-3-3-3--2/3-3-3-3--2/3-3-3-3--2/3-3-3-3-|


Verse:
G------------------|------------------|-----------------|-----------------|
D----------3-3-3-3-|------------------|---------3-3-3-3-|-----------------|
A--3-3-3-3---------|-3-3-3-3----------|-3-3-3-3---------|-----------------|
E------------------|---------3-3-3-3--|-----------------|-3-3-3-3-3-3-3-3-|

The Intro and Verse riff repeat throughout the song. You just have to listen to figure 
out which goes where.