I can't seem to get the rhythm exactly right. Does he alternate between relaxing his strumming hand and palm muting?
Yeah. Scratchy messy palm muting mixed with the strumming. It's quite easy to do if you've got an experienced style.

When I play it, my hand practically is bouncing down on to the strings with certain strums.
Last edited by TechnicolorType at Sep 13, 2010,
I'm still a beginner. I tried relaxing and holding my hand down but my right hand doesn't want to relax once my hand's on the bridge. Is it even considered a beginner song? hah
What I do is just let my palm mute the strings as I down pick and let the notes ring out with the up strokes.
Here have a waffle!