From a 1978 New, Old and Unexpected with guest Philip Glass, today's archival interview was first broadcast commemorate the radio debut of the composer's 1976 breakthrough opera, Einstein on the Beach. Host Tim Page spoke to Glass about the opera's thematic material and the process of editing down the five hour run-time to a broadcast-friendly duration. 

Each day at 6 pm during Music of Constant Change: A Philip Glass Festival, Q2 Music will be airing archival interviews from across the iconic composer's many visits to New York Public Radio. For a complete schedule of historic Philip Glass interviews, visit here. 

Other episodes for this 6 pm feature include:

September 5: Survival Kit with Leonard Lopate (2003) and Around New York with John Schaefer (1995)
September 6: Meet the Composer with Tim Page (1985)
September 7: The Leonard Lopate Show (2002) and New Sounds with John Schaefer (1985)
September 8: The Leonard Lopate Show (2007, 2008)
September 9: Soundcheck with John Schaefer (2002)

Audio courtesy of the New York Public Radio Archives.