DR Jrand73, it seems like there's ambiguity surrounding the permissions or advisements re what to include or alter in the show.
Supposedly MTI now suggests or comes right out and tells theeders (or maybe just schools?) - in their contract - to omit the entire "Nightingale" sequence, and Man in Chair has supposedly been changed to Person in Chair. But there's no hint of these on MTI's website. "My little monkey" is apparently "my little bunny" now, and I'm sure that very few groups would use the line "I'm singing a song an old Negro taught me" unmodified. I'm sure there's more I'm forgetting or am unaware of.
I need to get hold of one of the vocal books and have a look at the PC score. I'll try to do that tonight.