The Toccata in C major, Op. 7 by Robert Schumann, was completed in 1836. The piece is in sonata-allegro form.
When the work was completed in 1836, Schumann believed it was the "hardest piece ever written. A series of chords introduce the main theme. The development features rapid unison octaves.
A typical performance of this piece lasts about six minutes.
Schumann dedicated the work to his friend Ludwig Schuncke, who had dedicated his Grande Sonata in G minor, Op. 3, to Schumann.
References
Toccata (Schumann) Wikipedia(Text) CC BY-SA