Contrast with his voice is what makes this album work. The tension between the deep rough vocals & the gentle beautiful guitar. The tension between the rough sound of the voice and the gentle words that are sung.
Campbell seems to have not made much of a mark in the US, which is a shame. His wiki says that an album was going to be released in 2010, but that didn't seem to happen. Hopefully 2012 will be a productive year for him. I'm looking forward to it.