the music directors last name was Speed...he is 20 yr friend.....reckon he might be a source....he allowed it was the prettiest song he ever heard live
Whitney must have some serious talent to be able to turn her head away from the mic and keep her vocal volume the exact same. She very well could have been singing, but that voice heard over the PA was recorded.
Wiki article stating it was lip synced.
This is not a secret that she didn't sing that song live.