Comprised of Jose Guajardo (accordion, vocals), Esteban Guajardo (bass, vocals), Francisco Romero (bajosexto), and Jesus Flores (drums), Los Amos began their recording career in association with the label Mar International, releasing albums including Corridos de Peligro (1996), Los Amos de Nuevo Leon (1996), and Sentencia de por Vida (1996). Los Amos then released a series of major-label albums in association with Universal Music Group: Pantano de Cocodrilos (1999), Completamente Tuyos (2001), and Regreso Al Pantano (2002), plus the greatest-hits compilation album Oro Norteño (2002). Several years later Los Amos resurfaced on the independent label Solo Records with El Hyphy (Jai-Fi) (2008). By 2013, they had incorporated more electronic beats into their music and dubbed this new sound "hyphy," a nod to the party-rap tracks that came out of Bay Area hip-hop. Their album The Ultimate Hyphy Collection appeared that same year. ~ Jason Birchmeier