There are many strings to Kasia Kowalska’s bow—leader for a clutch of Polish bands, solo artist, Eurovision contender. When it comes to powerful, expressive songwriting, she’s a standout, with potent vocals enhancing plainspoken and candid songs that often hold a magnifying glass to women’s treatment in the world. Her music often eludes definition: a blast of trumpets, electronic loops, organ-inspired synths—it’s all on the table with her diverse pop rock sound.