Johannes Brahms was also a highly accomplished pianist, and consequently, some of his piano works are large-scale pieces demanding considerable virtuosity. This particular work, characteristic of Brahms's mastery of variations, employs highly advanced compositional techniques. It is said that even Richard Wagner, despite their antagonistic relationship in the musical world at the time, was greatly impressed upon hearing this piece. A simple theme is followed by 25 variations, culminating in a fugue. This is the only fugal work among Brahms's published piano compositions.