Happyface

Riff A
1:---------------------------------------
2:---------0----------0---------------0--
3:-4-4-4-4-0-xx-2-2-2-0-x-x-x-x-2-2-2-0--
4:-4-4-4-4-0-xx-2-2-2-0-x-x-x-x-2-2-2-0--
5:-2-2-2-2-0-xx-0-0-0-0-x-x-x-x-0-0-0-0--
6:---------------------------------------
	(for those open strings, you can through a G chord if you want instead
	it all sounds good)

Riff B gtr 1.
1:--------------------------------
2:---------------------------3^---
3:-2h4-4-4-4p2-2-2-2h4-4-4-4------
4:--------------------------------

Riff B gtr 2.
4:-4-4-4-4----7-7-7-7------------4-4-4-4----7-7-7---8\7-
5:-2-2-2-2----5-5-5-5----7-7-7---2-2-2-2----5-5-5---6\5-
6:-----------------------5-5-5--------------------------

Riff C
3:-4--------2----------
4:-4--3--4--2--3--4--2-
5:-2--3--4--0--3--4--2-
6:----1--2-----1--2--0-

That's the meat n' potatoes of the song...for Riff B, gtr 1, try
muting some notes by playing it how you see it, just let your finger 
slightly up from the fret board so there's still a note, but its muffled 
every other note...sounds nice!