Bartók taught piano at the Music Academy in Budapest from 1907 to 1934. In his first years as a professor the Budapest music publishers Rozsnyai and Rózsavölgyi commissioned him to prepare so-called instructive editions (including suggestions, commentaries and fingerings for the performer) of several classics of the piano repertoire, altogether more than two thousand pages of music. Following Bach and Beethoven, Mozart was the third classical titan of whom Bartók ventured to undertake a performi...