Without settling on a consistent tempo, Argentina stays unpredictable, bound loosely by a love of sensual '80s synth pop and come-hither house. Index slinks in with "Bando-lero," an electro-tango that dances across a deep acoustic bassline and accordion sample, while the dance-floor mope of "Manzana de Metal" by Altocamet is the comp's most vivid throwback. Its sultriest spin is Burnin' Vibra's "Abusada," a noir-pop revision of an Astor Piazzola tango that shows just how hot the new Argentinian underground can be. This collection is currently available only on the Sonic360 Web site (www.sonic360.com), though it'll soon be downloadable from the iTunes and Napster online stores.