Featuring Katie Viqueira - voice; Nando Michelin -piano, musical direction; Bertram Lehmann - drums; Fernando Huergo - bass, Laura Arpiainen - violin. This evening Buenos Aires native Katie Viqueira is back at the R-bar for a night of "CanTango," her unique vocal blend of passionate Tangos, Candombes, Milongas and Chacareras. Assisted by pianist and musical director Nando Michelin, drummer Bertram Lehmann, bassist Fernando Huergo, and special guest violinist Laura Arpiainen …