Now I know why, because the video stream from the concert is still available. Here’s the programme, with much more detail available here:
John Cage: The Beatles 1962-1970
Dmitri Shostakovich: Concertino
Witold Lutoslawski: Variation on a Theme by Paganini for Two Pianos
Colin McPhee: Balinese Ceremonial Music
Glenn Buhr: Two Pieces for Three Pianos (world Premiere)
Steve Reich: Six Pianos
John Terauds