As it approaches its fortieth birthday, it is high time Notus put out its first record. Founded in 1980 and based in Bloomington, Indiana, the choir is known for its commitment to new music and has premiered over 150 works. Five of their commissions are featured here. Of Radiance and Refraction, their debut album, demonstrates the wealth of talent found in the student ensemble led by Dominick DiOrio, as well as the remarkable works written for them by composition teachers at the Indiana University Jacobs School of Music, some tackling choral music for the first time. The album is anchored by John Gibson’s substantial work for chorus and electronics, In Flight. His music is paradoxically dark and brooding, light and airy, witty and sardonic. While Icarus is already drowning and half submerged in Brueghel’s painting of the same name, Gibson’s first movement paints the entire story: an opening pastoral scene transforms into the movement of meltin...