I have no idea why this shocked me so much.
It sorta reminds me of the infamous Linda McCartney board tape.
For an elaborate stage show like Britney and etc, where the singer is running around huffing and puffing and frolicking and stuff for most of the performance, a great deal of the vocals are of the canned variety, since nobody cares anymore (that poor Milli Vanilli guy gave his life in vain, alas). The rest is heavily processed through on-the-fly correction softwares like Autotune or Melodyne.
Surprisingly though, even the “good” singers don’t always come off too well when their live vocals are isolated this way. I’ve heard plenty of instances where a vocal performance I had originally found to be very powerful sounded much different when separated from the other parts of the whole. (Not to the extent of this Britney video, though)
