Contrary to what the Idol franchise, the Grammy Awards, the American Music Awards, the Billboard Music Awards, the Juno Awards et al would have us believe it is possible for a singer to appeal to their audience without shrieking, be it produced by the singer or the audio engineer.
The film Les Misérables (2012) is an excellent example of raw, spontaneous singing. Nothing is contrived. That was director Tom Hooper’s intent behind the characters singing live during filming. The usual practice is to dub in a prerecorded soundtrack, which provides an opportunity to manipulate the final result.