The 33 Variations on a Waltz by Diabelli, Op. 120, commonly known as the Diabelli Variations, is a set of variations for the piano written...

The 33 Variations on a Waltz by Diabelli, Op. 120, commonly known as the Diabelli Variations, is a set of variations for the piano written between 1819 and 1823 by Ludwig van Beethoven, on a waltz composed by Anton Diabelli. It is often considered to be one of the greatest sets of variations for keyboard, along with J.S. Bach's Goldberg Variations.