Up until recently, the Swedish pop singer Zara Larsson was an also-ran, almost a punchline. Larsson scored a few breakout American hits in 2015, when she was 17. After that, she went a decade without making much impact over here, other than one 2018 single that scraped the bottom of the Hot 100. She kept making music, and she had her fans, but her impact was minimal. Right now, though, Larsson is riding a huge resurgence, and she is taking full advantage. It started with a dolphin meme. In 2024, TikTok users started posting dark emotional thoughts along with Lisa Frank-type dolphin images and audio of Larsson and Clean Bandit's 2017 collab "Symphony." Larsson didn't know what was happening, but she celebrated anyway . Last year, Larsson released a very good album called Midnight Sun , recorded with her longtime collaborator MNEK, and she joined Tate McRae's tour as the opener. Her video for the title track, one of my favorite songs of last year , went all-in on the dolphin meme imagery.…