An ecotone is a transition area between two adjacent but different plant communities, such as forest and grassland. It may be narrow or wide, and it may be local (the zone between a field and forest) or regional (the transition between forest and grassland). An ecotone may appear on the ground as a gradual blending of the two communities across a broad area, or it may manifest itself as a sharp boundary line. The word ecotone was coined from a combination of "eco(logy)" plus "tone", from the Greek tonos or tension - in other words, a place where ecologies are in tension.

Ecotone finds ambient sound sculptors James Johnson and Brian McWilliams (aka Aperus) at the height of their powers as they deliver a deeply textured environmental sound study using field recordings, electronics and organic instruments.

In the studio, the duo improvised and recorded whatever happened as they worked with a wide variety of compositional techniques....