Well, this is the intro of Why by The Naked Brothers Band on Guitar

e|-------------------------1--------------------|
B|-----------------1-1-1-3---3-1----------------|
G|-3-3-3-3-3-3-3-3-----------------3~-----------| 
D|----------------------------------------------|
A|-1-------1-------3-------------1--------------|
E|---------------------------------------1------|

Then repeat when Alex start singing. You should hear it very well before trying to play, 
because the last note that appears in the tab it's a really bass note that almost doesn't 
sound so you have to use headphones to listen this note clearly.