"Open a little mercy/Open all immensity," sings the brilliant Argentinean singer/songwriter (in Spanish) over spacy synths on this ambitious and sophisticated 1999 album's opener. Eleven-minute centerpiece "La Casa Desaparecida" (The Disappeared House) unwinds Páez's poetically sour history of modern Argentina over a reggae beat. Another extended track, "Desierto" (Desert), is an encyclopedic study of decadence and desire over heavy, head-nodding riffs—and Páez sounds right at home.