During Lucy Dacus’ last show at 9:30 Club on Dec. 7, 2019, she started the encore with a new song. She’d played it live at other solo tour stops that year, and it’d been heard at shows for her supergroup boygenius. When she came out from backstage, she asked the crowd to be quiet and not to record, then mentioned that she hadn’t yet released the track, but that she was looking into it. Then she launched into “Thumbs,” […]