“Illuminating Boulez,” this week’s MusicNOW program celebrating the legacy of composer-conductor Pierre Boulez, features the world premieres of two commissioned works: Marcos Balter’s shadows of listening and Pauline Oliveros’ For Two or Three Instruments.

In a series of short videos, CSO musicians John Bruce Yeh (assistant principal clarinet), Robert Kassinger (bass) and Stefán Ragnar Höskuldsson (principal flute), along with guest musician Conor Hanick (piano) discuss Boulez’s legacy and the process and performance of “Illuminating Boulez.”