this riff is very easy, and you need the whammy pedal to use it (not whammy bar, the
pedal)
[ Tab from: http://www.guitaretab.com/c/ciara/75169.html ]
e|--------------------13 >--13 <-----------------------------------------|
B|-----------------------------------------------------------------------|
G|-10 >--10 <--10 >------------------------------------------------------|
D|-----------------------------------------------------------------------|
A|-----------------------------------------------------------------------|
E|-----------------------------------------------------------------------|
pedal up= >
pedal down= <
btw, set your pedal to up one octave...not down one, or up two or something wierd like that