Los Alegres de Terán
Eugenio Ábrego and Tomás Ortiz met at a club in Nuevo León in the mid-1940s — Ortiz on bajo sexto and lead vocal, Ábrego on accordion and second voice — and by 1948 had cut "Corrido de Pepito," the record UCLA's Strachwitz Frontera Collection credits with founding modern norteño music. Until then, writes archivist Agustín Gurza, accordion music was mostly instrumental and vocal duets stuck to guitar; Los Alegres de Terán were "the first to combine their harmonizing with the accordion," singing in tight "parallel thirds" that gave every line a strained, emotional edge. Falcon Records' 1953 hit "Carta Jugada" made them the format's first stars; over four decades and 100-plus records they carried the corrido across the border their migrant fans crossed, entering the Tejano Conjunto Hall of Fame in 1983. Nearly every norteño duet since has borrowed their blueprint.
Narciso Martínez built the instrument Los Alegres de Terán would later sing over. Nicknamed "El Huracán del Valle," he and bajo-sextista Santiago Almeida fixed the basic conjunto template in the mid-1930s — accordion carrying the melody, bajo sexto anchoring the bass — a "snappy, staccato sound... copied or imitated by virtually every conjunto accordionist who followed him," per UCLA's Strachwitz Frontera Collection. Producer Chris Strachwitz recalled that Martínez "felt his lack of singing ability held him back." Los Alegres de Terán supplied exactly what he lacked: by the late 1950s, singing acts built on his format, Los Alegres among them, had pushed him off the charts.
listen for"La Chicharronera" is pure instrumental duet: Martínez's accordion runs the melody in short, clipped phrases while Almeida's bajo sexto thumps the bass beneath it — no voice anywhere on the record. Cue up "Carta Jugada" and that same two-part frame is still there, accordion answering bajo sexto exactly as Martínez built it, but now Ortiz and Ábrego's close-harmony vocal rides on top, carrying the corrido's plot the accordion once carried alone. The chassis didn't change; a pair of singers just climbed into it.