Pink is a great vocalist. Most critics understand and her peer musicians get this. Singing live, sans enhancement, is challenging.  Live vocal performance within key , and perfect pitch is rare. Imagine adding the Olympic challenge of high wire acrobatics to the mix? Hush now. I prefer the vocal acrobatic octave range A capella Pink.  What about you?

 Just watch and listen to the Best Live Vocals video, then the duet with Nate, from Fun:

Just Give Me A Reason (Live)