Shania Twain entered Nashville’s Bridgestone Arena Saturday night walking through the crowd like a prizefighter headed to the ring. The capacity crowd erupted at the sight of the pop-country royal as a drummer in the middle of the floor pounded out the rhythm to Queen’s jock jam “We Will Rock With You.” That incessant beat bled into the bouncy opening of Twain’s own personal victory song, “Life’s About to Get Good,” as she took the stage and stood triumphantly to perform the track off her 2017 comeback ...