i posted before about some muzak in a chinese restaurant, and something related happened today in a nearby mexican restaurant:
the music was definitely not muzak or radio, nor was it quite mariachi. it was in the mariachi tradition, with typical lyrics about "mi corazon" and "besame mucho", but much improved from its century-old oompah influence.
the first track sounded like security-era peter gabriel, the next track had an easy stereolab lounge influence, another had a "blinded by the light" style organ ostinato holding it together. another track had simon and garfunkel harmonies, and another had some brief chromatic dissonance that could have come from soundgarden or the foo fighters (with a third of the distortion).