I haven't heard the whole thing in quite a while, but it was Glass' custom in his early work to have vocalists sing only solfeggio syllables (ie: "do-re-mi-fal-sol-la-ti"), so I'd imagine what you're hearing is a combination of thise and not actual words.
― Nom De Plume (Nom De Plume), Sunday, 8 February 2004 00:24 (twenty-two years ago)