Robert speaks with three musicians — guitarists Sergio and Odair Assad, and violinist Nadja Salerno-Sonnenberg, about their new CD collaboration, based on Gypsy music. The music bears hints of Spain, Eastern Europe, and the Middle East. The songs are written and arranged primarily by Serio Assad. The three are currently on tour to small venues in the US, appearing at "Hot House," in Chicago tonight. They head next to San Francisco and Los Angeles.