Last night at the Rancho Mirage Library, the distinguished chamber music ensemble Camarada delivered an invigorating performance of Argentine musical masterworks in a program titled Camaraderie: Tango Obsession. Andrés Martín, the group’s bassist and composer-in-residence, introduced each piece with brief comments about its cultural and historical context. I enjoyed hearing the scintillating rhythms and seductive melodies of Tango Nuevo music and learning how it evolved.