For a generation that hit puberty during the great Y2K pop explosion, Christina Aguilera was an essential voice. Her music tackled self-empowerment, feminism, sex and domestic violence — subject matter her contemporaries were shying away from. But the big-lunged singer lost her footing along the way and took an extended hiatus from music. Reconnecting with her purpose led to “Liberation,” her first album in six years and one that showcases an artist reborn. She’s hitting the road for her first tour in a decade and setting up in relatively cozy venues for a star. The Greek Theatre, 2700 N. Vermont Ave., $59.50-$279.50. www.lagreektheatre.com. (GDK) For a generation that hit puberty during the great Y2K pop explosion, Christina Aguilera was an essential voice. Her music tackled self-empowerment, feminism, sex and domestic violence — subject matter her contemporaries were shying away from. But the big-lunged singer lost her footing along the way and took an extended hiatus from music. Reconnecting with her purpose led to “Liberation,” her first album in six years and one that showcases an artist reborn. She’s hitting the road for her first tour in a decade and setting up in relatively cozy venues for a star. The Greek Theatre, 2700 N. Vermont Ave., $59.50-$279.50. www.lagreektheatre.com. (GDK)

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