Esteemed and prolific Canadian artists Dorian Williamson and Jim Field have forged a prodigious and variegated sound mosaic in their musical career as Northumbria. Formed in 2011, the band released their debut album Black Sea of Trees in 2012, followed by a series of EPs: Northumbria on TQA Records (2012); The Silver Forest (2013) on Waxen Wings; the ap…