Chris Willman Senior Music Writer and Chief Music Critic When the lineup for the 2024 Stagecoach Festival was announced earlier this month, Bailey Zimmerman’s name was up there on the second line, right beneath Morgan Wallen’s. It represented a heady move up into the big leagues (and big fonts) for a 23-year-old who had only the most scant awareness that there was such a thing as a country music industry a few short years ago.