Enrique Iglesias was called out by Howard Stern for crappy vocals in his concert 23 years ago (good lord!).[0] Enrique explained that they overdubbed some of his songs so much in concert that you couldn't tell he was deliberately singing off key, that is until someone gave Howard Stern a copy of the mic feed.
[0]https://www.youtube.com/watch?v=98UWTDFaEYo