Marty! wrote: According to the know it all Wiki: "Auto-Tune uses a phase vocoder to correct pitch in vocal and instrumental performances. It is used to disguise off-key inaccuracies and mistakes, and has allowed singers to perform perfectly tuned vocal tracks without the need of singing in tune." Or in layman's terms, it's why you know who Britney Spears is.
And why you shouldn't waste money on a live performance by some certain "artists".