The Variations on a Theme of Paganini are a set of theme and variations for solo piano, written by Johannes Brahms (Op. 35). The theme that is the basis for the work is that of the Caprice No. 24 in A minor by Niccolò Paganini. Brahms' piece is well-known for its emotional depth and technical challenge. Structurally, the work is divided into two sections ("Book I", Op. 35/1 and "Book II", Op. 35/2), with the theme stated at the beginning of each section. Each section concludes with a virtuosic finale-style variation.