Holy Radiant Light
Recorded in the Grace Episcopal Church narthex, June 20, 2006, by an ensemble of about 16 students and alumni conducted by Dan Sharp
"Holy Radiant Light" by Alexandre Gretchaninoff
Edited and arranged by Noble Cain
Octavo No. 8081 G. Schirmer, Inc. © 1937 (http://jwpepper.com/pdf/1275056.pdf)
The text is a translation of the Phos Hilaron, likely the oldest extant extra-biblical hymn in existence.