Lythgoe suggested to reporters that he wants the judges this season to focus on all aspects of a performance, instead of just whether or not the contestants are in tune.
"Any information that they can feed into helping the kid in that short period of time they've got to judge, I think is great," he said. "The different angles that they can come from, knowing that it isn't just about the voice and really, does it matter if they sing out of tune a little bit?
"Everybody I've ever seen live sings out of tune, even the greatest singers in the world. And of course if you make a single nowadays, they'll autotune it anyway. So is there more we should be discussing rather than, 'You're pitchy'? I'm so sick of that remark."
Lythgoe also revealed that Randy Jackson - who is known for describing contestants as "pitchy" - is the harshest judge this season, beating new additions Nicki Minaj, Mariah Carey and Keith Urban.
"When other people coach they're, 'No, you were crap'; Randy says, 'Give up singing, you're never going to be a singer, give it up'," he explained. "And you can see the other three judges wince, because although they may agree with that outright sentiment, they certainly feel like they're not there to hurt anybody."
Lythgoe also said during his interview with reporters that the feud between Minaj and Carey is not the sort of publicity he wants, explaining that American Idol should be "about the contestants".
The new season of American Idol starts with a two-night premiere on Wednesday and Thursday (January 16 and 17) on Fox. UK viewers will be able to watch the new season on 5* when the first episode debuts at 8pm on Thursday, January 17.