Boulder, CO's 40-strong, mixed-voice Choral ensemble 8 works by 5 composers of Polyphonic works, two from the Renaissance, Thomas Tallis' 'Spem in alium' and Alessandro Striggio's 'Ecce beaatam lucem,' both motets for 40 voices; Stephen Paulus' 3-part 'Meditations of Li Po,' conductor Thomas Edward Morgan's 'Images from Thoreau' (for 40 voices); and Georgy Ligeti's 'Lux aeterna' (for 16-part chorus). There is a stunning photo of the Northern Lights on the cover of 'Luminescence,' and what we hear is the musical equivalent of this beautiful, haunting show.