Many classical and later composers have written compositions in the form of variations on a theme by another composer. This is an incomplete list of such works, sorted by the name of the original composer. The list does not include variations written on composers' own or original themes, or on folk, traditional or anonymous melodies. Many of these works are called simply "Variations on a Theme of/by ...". Other works, which often involve substantial development or transformation of the base material, may have more fanciful titles such as Caprice, Fantasy, Paraphrase, Reminiscences, Rhapsody, etc. These other types of treatments are not listed here unless there is evidence that they include variations on a theme.