Amazon.comLos Alegres de Teran--accordionist Eugenio Abrego and bajo sexto player Tomas Ortiz--entered the norteño canon when they popularized the vocal duo harmonies over the standard bajo sexto-accordion template. It's a simple yet beautiful sound that's worked for five decades and has been emulated by dozens of followers. Throw in painful lyrics of unfaithful women, hard times, and a blues-oriented sense of healing through confessionals, and you've got the soul of authentic norteño. Grade-A cuts include the let's-drink-to-ease-the-pain tune "Señor Cantinero," the second-guessing game of "Me Toco Perder," and the backstabbed-again tale "Vagando sin Fortuna." But all is not bitter pain and loss. The slow, gorgeous polka "Se Acabo Mi Amargura" relates the miracle of true love's arrival. --Ramiro Burr