The cycle 24 Etudes in All Major and Minor Keys op. 44 by Józef Wieniawski (1837-1912) demonstrates the essential unity of the virtuoso and the composer in a dynamic process of transforming the genre. This played an important part in providing innovative solutions not only in relation to piano-playing, but also in its signifi cant infl uence on the development of texture, diversifi cation of the instrumental sound and the expansion of means of musical expression in nineteenth-century piano music. Wieniawski, following Transcendental etudes or Concert etudes by Liszt, whose pupil he was in Weimar, blurs the boundaries between improvisation and composition; he draws attention to the unique nature of interpretation, its singularity and ...