Vocal group Anuna's first release of new material in six years is a major leap forward from their last few offerings, throwing into high relief the progress that founder and group leader Michael McGlynn has made as a composer. The opening track '0 Ignis Spiritus' brings a text by medieval mystic Hildegarde von Bingen to glorious life, with Ken Edge's saxophone matching the reedy timbre of soloist Miriam Blennerhassett's wonderfully rich voice. The dreamy title track (McGlynn's setting of the Rimbaud poem of that name) is another highlight, with the gravel-voiced Gilles Servat speaking the verses over the ensemble's multi-layered harmonies. Bringing the CD to an electrifying close is the shimmering, densely textured '0 Maria', which deserves to become part of the standard repertoire for choral groups everywhere.