Armed with a cello and the untethered voice of an angel, Icelandic Chinese singer-songwriter Laufey enthralled audiences at The Sinclair in Cambridge Tuesday night, with hits detailing bad dates, heartbreaks and lifelong friendships.

Everything about “Jackie” is beautiful. From the first lady’s wardrobe to the symmetry in each frame to the booming score, the film’s beauty is eerie, haunting even, among such obvious...