Variations on a Theme by Robert Schumann in E flat major,op.23 for piano four hands Variations on a Theme by Joseph Haydn in B flat major,op.op.26b for two pianos Variations on a Theme by Robert Schumann in F sharp minor,op.9 Variations on a theme by Joseph Haydn: in B-flat major, op. 56a Variations on a theme of handel, in B flat major op. 24