“The preternatural pop knowhow of Swedes like mega-producer Max Martin defies logic—are these chart-crushing Scandinavian songwriters synthesized by Spotify apparatchiks in test-tubes? Whatever the case, the country's pop precocity is also evident on the hit parade's scrappy margins, where Swedish outfits like Masshysteri and Bäddat För Trubbel have recently dealt in straight-ahead punk with surfei”