Yeah, some of them don't have autotuned voices, like Lea Michele. The only song I think had her autotuned was "Telephone," and that was only because that song IS auto-tuned naturally. Other than that, all of her songs are her natural voice. She's got good, raw talent. Also, Naya Rivera, Amber Riley, have good voices that have not needed auto-tuning. Now, some of the other characters may need auto tuning, but they're not heavily pressed in the show. Cory Monteith and Diana Agron are some of the lesser talent of the show, but they've still got good vocals that show in certain songs.