The lyrics on Y Lo Que Le Sigue often examine heartbreak with an unblinking candor, but the music always remains a freewheeling blast of norteño fun. While songs like “De Qué Sirvió” and “Esperándote” come loaded with devastating moments, Norteño 4.5 manage to make even their darkest románticas feel uplifting, thanks in no small part to their arsenal of wicked accordion hooks. And just try to keep up when they kick into rhythmic overdrive on sizzling corridos like “Qué Chulo Vicio” and “Me Mato.”