Sharon's right!
I work at WDW in ent. and I was inquiring about getting a recording of two of my favorite performers at Festival of the Lion King and I was told that due to equity contract, they couldn't be professionally recorded in any way. (but bring a tape recorder or video camera any time ya like!)
Also, I have that Hunchback recording from the WDW Forever System and mine has full vocals by the recorded chorus and the equity singers (Quasimodo, Clopin, Esmeralda and the Gargoyles). But only them singing, no dialogue. So Sharon, if you have that show with NO equity singers, PLEASE PLEASE PLEASE contact me!!
Also, Festival of the Lion King has a CD for guests to purchase. It's (pretty much) the opening cast. I guess they signed off on having their recorded voices sold to the masses (or however those kind of contracts work- I won't pretend to know).
Other stage shows with Equity singers that made it to WDW Forever System:
*Voyage of the Little Mermaid
*Beauty and the Beast (the "old" version that changed in 2001)
*Pocahontas stage show (MGM)
*Journey Into Jungle Book (AK)
There may be more, those are just the ones I have.
Hope the info helps!
*Tommy