Priscila y Sus Balas de Plata (Priscila and Her Silver Bullets) turned heads as the first popular norteño group to feature a female accordion player. They also heralded a new generation in norteño music by filling their band with hunky late-adolescent musicians, chipping away at the notion of those groups being led by heavyset middle-aged men. Siblings Priscila (b. 1978, accordion, keyboards, vocals), Tirzo Jr. (accordion, keyboards, vocals) and Ursula Camacho (percussion, vocals) were born in Mexico City to a musical family -- their father Tirzo Paiz (born Tirzo Camacho) is a...