In one of the more curious, unlikely – and, let’s face, envy-inducing – collaborations headed by a Irish singer-songwriter in quite some time, Belfast-based folk songsmith Mark McCambridge AKA Arborist has unveiled his latest effort, featuring backing vocals from none other than Kim Deal. Speaking about the collaboration, McCambridge said: “The harmony part was always there, from the moment the song was written and recorded here in Belfast.  But it needed a unique voice.  Fancifully, we drew-up a shortlist of desirable candidates with Kim far and away top of the list.  So, we contacted her – as you do – and after a…