Intro/verse
e|---------------------------|
B|---------------------3-2---|
G|-------2-----2--2-4--------|
D|--4-4-----4----------------|
A|---------------------------|
E|---------------------------|
When the verse starts the bass starts playing
Check the bass tab here on ultimate-guitar, it's not great but it works :P
Chorus:
[ Tab from: http://www.guitaretab.com/r/rihanna/257582.html ]
e|--------------------------9---10----9---10--9---14--14-!
B|---12---10--12--10--12----10--12----10--12--10--15--15-!
G|---12---11--12--11--12---------------------------------! X3
D|-------------------------------------------------------!
A|-------------------------------------------------------!
E|-------------------------------------------------------!
Play this two
Em F#m G sections twice
e|-------------------9-----7---9---10---------------------|
B|---12-10-12-10-12--10----8---10--12---------------------|
G|---12-11-12-11-12--------9---11--12---------------------|
D|-------------------------9---9---12---------------------|
A|-------------------------7---9---10---------------------|
E|--------------------------------------------------------|
Bridge:
The Bass starts playing this
G|-------------------|
D|-------------------|
A|--5-5-7-7-2-2-2-2--|
E|-------------------|
Then a synth start playing like this
e|--10-10--12-12--14-14-14-14---10-10--12-12--9-9-9-9----|
B|--10-10--10-10--15-15-15-15---10-10--12-12--9-9-9-9----|
G|-------------------------------------------------------|
D|-------------------------------------------------------|
A|-------------------------------------------------------|
E|-------------------------------------------------------|
e|--14-12-15-14--10-10-10-10--10--9--12-10--9------------|
B|--15-12-15-15--10-10-10-10--10--10-12-10--9------------|
G|-------------------------------------------------------|
D|-------------------------------------------------------|
A|-------------------------------------------------------|
E|-------------------------------------------------------|