The first time I heard this was the album version, and I had no idea who, or what, I was hearing; I just thought it sounded really nice. Then I played it again a week or so later, and the intro caught me; is that one guitar or two? The more of that intro I listened to, the more it seemed to be only one player; but how was he doing it? Maybe it's one of those harp guitars; if so, I have to see it.
So, I ran a search.
Here is the same song with video; the name of the song is Sira. It's a duet; but the intro is indeed just one player. His name is Ablaye Cissoko, and this song is beautiful. Pay particular attention to the intro, before the singing and trumpet come in, and to how he weaves melody, chordal movement and harp-like embellishments together seamlessly, yet with wonderful attention to dynamics.
I just really like the way this song is put together. Ablaye's vocals and the trumpet statements by Volker Goetze just add to the overall beauty of the tune.