Johann Dubez (1828 – 27 October 1891) was an Austrian virtuoso on several instruments mandolin, guitar, harp, and zither as well as a composer. [Fantasia on Hungarian Themes] Life Dubez was born and died in Vienna, Austria, of Italian extraction.[1] In 1846, he was engaged as violinist in the Josefstadt Theatre, Vienna, and formed there an acquaintance with the guitar vir..