Did you know that Christina was meant to sing over vocals towards the end?

The Bit that I think Underwood does?
But pulled out because record labels WERE BIDDING for people to sing.

Mathew Knowles paid $500,000 for Bee to sing the most etc.
TBH, that's sick on a charity single.

That's why Xtina isnt on it, and same with Alicia and P!nk.

:)