Yeah the add9 arpeggios were integral to the Police sound and on three main tracks Message In A Bottle, De Do Do Do, De Da Da Da and Every Breath You Take. The last one being the more difficult of the three IMO as to play it in the recorded key means doing a five fret stretch off of the F. You can see even Andy grimacing a few times playing it on the Atlanta live video in '83 towards the end of the track. They're also a bit like high speed legato, once the tension creeps into your hand its almost impossible to get rid of without stopping...