The Variations and Fugue on a Theme by Handel, Op. 24, is a work for solo piano written by Johannes Brahms in 1861. It consists of a set of twenty-five variations and a concluding fugue, all based on a theme from George Frideric Handel's Harpsichord Suite No. 1 in B-flat major, HWV 434.
The great music writer Donald Tovey has ranked it among "the half-dozen greatest sets of variations ever written". Biographer Jan Swafford describes the Handel Variations as "perhaps the finest set of piano variations since Beethoven", adding, "Besides a masterful unfolding of ideas concluding with an exuberant fugue with a finish designed to bring down the house, the work is quintessentially Brahms in other ways: the filler of traditional forms with fresh energy and imagination; the historical eclectic able to start off with a gallant little tune of Handel's, Baroque ornaments and all, and integrate it seamlessly into his own voice, in a work of massive scope and dazzling variety."
The Handel Variations were written in September 1861 after Brahms, aged 28, abandoned the work he had been doing as director of the Hamburg women's choir (Frauenchor) and moved out of his family's cramped and shabby apartments in Hamburg to his own apartment in the quiet suburb of Hamm, initiating a highly productive period that produced "a series of early masterworks". Written in a single stretch in September 1861, the work is dedicated to a "beloved friend", Clara Schumann, widow of Robert Schumann, Brahms's musical and personal mentor. It was presented to her on her 42nd birthday, September 13. At about the same time, his interest in, and mastery of, the piano also shows in his writing two important piano quartets, in G minor and A major. Barely two months later, in November 1861, he produced his second set of Schumann Variations, Op. 23, for piano four hands.
From his earliest years as a composer, the variation was a musical form of great interest to Brahms. Before the Handel Variations he had written a number of other sets of variations, as well as using variations in the slow movement of his Op. 1, the Piano Sonata in C major, and in other chamber works. As he appeared on the scene, variations were in decline, "little more than a basis for writing paraphrases of favorite tunes". In Brahms's work the form once again became restored to greatness.