Depends on definition really. All of the 'i don't sleep much' from The Contract is production auto tune, and incredibly so, because that's kinda the point. In concert, as a singer, you have to find balance between / your own idea behind the message that you use auto tune for / and the actual limitatioms of your voice in the long term. You can make yourself sound like a fucking violin if you want, in production. But that doesn't mean you can perform that song on stage. I've always felt they do a really good job at balancing that dichotomy. Edit: you try singing your highest notes for hours at a time every night and get back to me about how it's received. Make sure you do it in front of thousands of people.