It's ironic that Demi Lovato or Brittany Spears rip into "pitch problems" of THE VOICE contestants.  Neither of them, in my opinion, are great singers themselves, and both resort to Auto-Tune devices to keep their own performances "pitch perfect"........Since Cher unleashed this monster.....studio performances are now "PERFECT", although the subtle and not-so-subtle nuances of interaction between the brain and emotions of a singer have been eliminated to the "greater good" of plastic slickness and vapid sameness.......More irony......that a program like THE VOICE, which originated as a venue to demonstrate raw vocal talent has succumbed to sheer commercial motivations to locate "voices" that can be manipulated to appeal to a pop audience that probably hasn't given any of this any serious thought whatsoever........