The union of composers Lawrence English and loscil (aka Scott Morgan) is seamless, sublime, and long overdue. Born of a conversation centered on the notion of “rich sources” as a forge for electronic music, Colours of Air is a collection of recordings of a century old pipe organ housed at the historic Old Museum in Brisbane, Australia, which were then processed, transformed, and elevated into eight majestic electro-acoustic threshold devotionals. The timbre of the instrument and spatial fluctuations of room tone infuse the music with a subdued, sacred feel, like vaulted light in a nave of stained glass. They describe the album as “an iterative project, a reduction and eventual expansion,” sifting the swells and drones of the organ for every shivering shade of radiance. The tracks are named...