This is the piano for Roar, I couldn't find it online for guitar so I made a tab for it
:) It goes through the whole song.
(For the intro, just play the first 2, pause, and start over for the rest of the song)
[ Tab from: http://www.guitaretab.com/k/katy-perry/371831.html ]
e ---6---------8--------6---------8-------------------------------|
B ---6---------6--------6---------6-------------------------------|
G ---7-(12x)---5-(4x)---7-(12x)---7-(4x)--------------------------|
D ---8------------------5-----------------------------------------|
A ----------------------------------------------------------------|
E ----------------------------------------------------------------|