Written by Jan Kazemier (wwwhizz) (wwwhizz _AT_ gmail _DOT_ com)

This is a great cover of the Rihanna song. 

The whole song is an ongoing repetition of the following chords:
Eb Bb D Gm

Between the Gm and Eb you should play a Gm/F-chord

The intro baseline is played like 1 - 3 - 5 - 6 5 3 - 
'-' means: let ring

Eg, for the Eb chord:
Eb - G - Bb - C B C G -