From the Koch International Press Release about the content of the 2-Disc DVD set of GLASS: A Portrait of Philip in Twelve Parts":

The extensive extras for GLASS: A PORTRAIT OF PHILIP IN TWELVE PARTS include a full-length director’s commentary by Scott Hicks, nine deleted/extended scenes as well as filmed interviews with Philip Glass from the Gramercy Park Hotel, Tibet House and the Met Opera House.  Four bonus performances are also featured on disc 2 of this incredible set including Philip Glass and Michael Riesman rehearsing “Dracula” with the Kronos Quartet; a solo piano performance of “Metamorphosis” in Melbourne; (50 minutes of) “Orion” with the Philip Glass Ensemble and featured artists Mark Atkins, Eleftheria Arvanitaki, Ashley MacIsaac, Wu Man, Kartik Seshadri, Foday Musa Suso, UAKTI and music director Michael Riesman; and “Einstein on the Beach” featuring Leigh Warren and Dancers in rehearsal with the Adelaide Vocal Project.  An 8-page booklet with Scott Hick’s production notes is also included with the DVD.