“You can take the girl out of the country world/But you can’t take the country out of the girl,” sings Christie Lamb on 2019’s “Old Country Soul.” That track, from her chart-topping third album, Broken Lines, could double as a mission statement for the Sydney singer/songwriter, who adapts classic country motifs for modern audiences without losing the genre’s quintessential heart. Where that song mingles rustic banjo licks and ghostly electronic melodies, 2022’s “Beat of My Own Drum” flirts with clubby percussion to echo its individualistic lyrical message. But even amid such production flourishes, Lamb keeps her songwriting remarkably to the point.