Starlight Express on Ice

I know this is a long shot, but does anyone have any info on the playback tracks for Starlight Express on Ice? I saw this in the late 90s and was too young to take notice of the vocals at all. From what I can gather, the producers were not able to credit the singers for legal reasons (hope they got paid well!), and I’m sure the only people who have ever had access to the track were the sound technicians of the tour. Still, stranger things have been leaked. Thought this might be the proper night lace to ask if anyone has any info or (wishful thinking) an actual copy.