Opus Cuatro
Introduction '''Opus Cuatro''' are an Argentine folk vocal quartet founded in La Plata in 1968.The group debuted on 10 July 1968 and become one of the most important vocal groups in Latin America, staying active since then without interruption. At the beginning of 2009, the quartet had carried out 7,100 performances in 450 cities worldwide, including 25 tours in Europe and nine in the United States.The founder members were Alberto Hassan (first tenor), Antonio Bugallo (second tenor), Lino Bugallo (baritone) and Federico Galiana (bass). Bugallo left the group in 1972, and was replaced first by Hannibal Bresca and then  Ruben Verna  until  Marcelo Balsells  was incorporated in 1982 and has remained ever since.
Discography #''América'', 1970#''Con América en la sangre'', 1971#''Si somos americanos'', 1973#''Opus Cuatro-Op. 4 - Vol IV'', 1976#''Opus Cuatro-CBS'', 1980#''Militantes de la vida'', 1984#''Un nuevo tiempo'', 1987#''Por amor'', 1992#''Jazz, spirituals, musicals'', 1993#''Opus Cuatro canta con los coros argentinos'', 1994#''No dejes de cantar'', 1996#''Opus Cuatro canta con los coros argentinos, volumen II'', 1997#''Milagro de amor'', 1998#''Opus Cuatro, se vuelve a más'', 1999 (edición para Europa)#''Cantata al Gral. Don José de San Martín'', 1999, dirección musical de Luis María Serra#''Opus Cuatro. Europa en vivo'', 2000#''Opus Cuatro, tangos, valses y milongas'', 2001#''Los opus y los vientos'', 2003, con el grupo Cuatro Vientos (Julio Martínez, Jorge Polanuer, Diego Maurizi, Leo Heras)#''Spirituals, blues & jazz'', 2005#''Opus Cuatro canta con los coros argentinos, volumen III'', 2007#''Latinoamérica vive'', 2007, Radio Nederland#''Opus Cuatro. Cuarenta años de canto'', 2008
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References