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:
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:
- - - -