I've just been listening to his Chiaroscuro album recently out on the magnificent Rune Grammofom label. Arve plays the trumpet heart wrenchingly beautifully and he sings in this ethereal falsetto. I can't really describe his work other than its sheer beauty, lacking in any kind of pretension, unique and, well, simply perfect.
Any other love for him or Rune Grammofon on the board? They're both a complete delight.
Here's a spotify link for the album I'm listening to http://open.spotify.com/album/7aBn46Rq8GP3zEGl6qY4dQ