I don't mind overdubbing so much; everyone makes mistakes and overdubbing just helps ensure that the finished CD is listenable over many sessions. I do, however, think that pitch correction like this is pretty dishonest. I'll grant that it's merely a question of degree; you could claim that it was just overdubbing if you cut-n-pasted individual notes that a musician happened to get just right, but we'd all recognize that as a travesty of the idea of performance. Pitch correction: okay as long as it's labelled.