From Christian Bale’s guttural Batman growl to Stephanie Beatriz’s deep-voiced depiction of Rosa Diaz on “Brooklyn Nine-Nine,” actors must often make their voices deeper for a role. If you’d like to ...

For his role as country singer Jackson Maine in “A Star Is Born,” Bradley Cooper spent 20 hours a week training his voice. While it may be—to paraphrase the film’s lead song—hard keeping it so ...