This is the intro (basically the same for the entire song) of All That Matters by Justin Bieber.

  p   >   S   >   S   >  S h  >           v   >  S   >  S h    p  p s
e-9---9-------4-------7--4----4----9-------------7---7---------4--7/9-}repeat
b-9---9---5---5---7---7--4/5--5----9---9--7---7--7---7--4/5----4--7/9-}
g-----9---6---6---5---5--4/6--6----9---8--6---6--5------4/6-----------}
d-----11--6---6---6------4/6--6----11--7--5---5--6------4/6-----------}
a-----11--4---4---6------4---------11------------6------4-------------}
E-----9----------------------------9----------------------------------}    

If you're lazy, the chord progression for this is just C#m, C#m, Ab7, C#m over and over again.

> = staccato
S = strum chord
s = slide
h = hammer on
v = vibrato
p = pluck