With Long Gradus, Sarah Davachi seizes the opportunity to take one idea and explore it from as many angles as possible. The celebrated composer and ambient artist is consistently investigating musical possibilities from a learned, authoritative perspective and so this latest project finds her expanding on an initial invitation to the Composer’s Kitchen residency in the Netherlands. Fundamentally scored for a string quartet, Davachi’s intention with the stirring, sustained tension of Long Gradus was that it could be performed on a number of different instruments, and this expansive four-CD edition on her Late Music label presents the piece performed on woodwinds, brass and organ and choir and electronics alongside the fundamental string version.