Earlier today I found a great service for those who play guitar, Youtab. This great service gives you the chords from youtube-videos. Among all the famous songs I found a great cover of Rihannas “Diamonds”.

http://www.you-tab.com/tabs/Savannah+Outen/Diamonds+Rihanna/15950418-1f8d-41fc-a569-128ee935ae0f#player_open