Variationen uber ein Thema von Joseph Haydn op.56a Variations on a theme by Joseph Haydn op.56a Variations on a theme by Joseph Haydn, op.56a Variations on A Theme of Joseph Haydn Op.56a Variations on a Theme by Joseph Haydn,op.56a Variations on a Theme by Josepyh Haydn op.56a Variations on a theme by Joseph Haydn, op. 56a Variations sur un theme de Haydn op. 56a Variations sur un theme de Haydn,Op.56a Variationen über ein Thema von Clara Wieck（克拉拉·魏克主题变奏曲）