With the exception of a visit to Vienna in 1787, Beethoven lived in Bonn until 1792, where he worked in the court chapel of the Elector of Cologne. Some forty compositions from this period are extant, including ten early works written by the young adolescent Beethoven when he was being promoted as a child prodigy performer and published as a result of the efforts of his teacher. It has been suggested that Beethoven largely abandoned composition between 1785 and 1790, possibly as a result of negative critical reaction to his first published works. A 1784 review in Johann Nikolaus Forkel's influential "Musikalischer Almanack" compared Beethoven's efforts to those of rank beginners. Whatever the case, most of Beethoven's earliest surviving works were written after he turned twenty, between 1790 and 1792. Some of this music was later published by Beethoven, or incorporated into later works. As such, they provide an important foundation for judging the later evolution of his style.