DADGAD  (Just drop your E and e strings down to D, drop your B down to A)

The intro is just this chord strummed and allowed to ring out:

e----0----------------0----------------|
B----0----------------0----------------|
G----2----------------2----------------|
D----0----------------0----------------|
A----0----------------0----------------|
E----0----------------0----------------|

The main riff goes something like this:

e----0--0--x-----0-0---0--0--0--0------|
B----0--0--x-----0-0---0--0--0--0------|
G----2--2--x-----2-2---2--2--2--2------|   Repeat
D----0--0--x-----0-0---0--0--3--0------|
A----3--0--x-----0-0---3--0--0--0------|
E----0--0--x-----0-0---0--0--0--0------|

For the sake of getting the feel/timing of this, it is worth pointing out that the 
repeating should
make it seem like the first two chords are always tacked onto the end of the progression.

Right before the guitar stops for the first chorus (after "...forgive me father"):

e----0-0--0--0-----0-0--0--------------|
B----0-0--0--0-----0-0--0--------------|
G----2-2--2--2-----2-2--2--Let---------|
D----0-0--0--0-----0-0--0--ring--------|
A----0-0--3--0-----0-0--0--------------|
E----0-0--0--0-----0-0--0--------------|


There are a few more little parts like the one above that are just simple
transitional variations - I have not tabbed each one.

Song Notes:

Notice that JPW holds his pointer finger on the 2nd fret of the G string for the whole thing,
just using his middle finger to play the notes on the A and D strings. Pretty simple 
once you
get the feel of it. Don't over think it, it's all about the groove.

You can add some style by throwing in some bends on the notes played on the A and D strings.

As I said, this tab is based off of the Jay Leno performance, but they play/sing it nearly
identically to the studio version.