A fortepiano [ˌfɔrteˈpjaːno], sometimes referred to as a pianoforte, is an early piano. In principle, the word "fortepiano" can designate any piano dating from the invention of the instrument by Bartolomeo Cristofori in 1698 up to the early 19th century. Most typically, however, it is used to refer to the mid-18th to early-19th century instruments for which composers of the Classical era, especially Haydn, Mozart, and the younger Beethoven wrote their piano music. Starting in Beethoven's time, the fortepiano began a period of steady evolution, culminating in the late 19th century with the modern grand. The earlier fortepiano became obsolete and was absent from the musical scene for many decades. In the 20th century the fortepiano was revived, following the rise of interest in historically informed performance. Fortepianos are built for this purpose in specialist workshops.