The edition is supplemented with a facsimile of the autograph to study the composer´s own manuscript in all its details.
Among the piano sonatas by Joseph Haydn, the Sonata in E-flat major Hob. XVI:49 is probably the piece we know most about in terms of genesis. It is one of the few sonatas that have survived in Haydn's own handwriting, and the correspondence between Haydn and his 18 years younger admirer Marianne von Genzinger refers to the work several times.
For this revision, a copyist's manuscript authorized by Haydn himself, which had become available again in 2009, could be consulted for the first time, illuminating many peculiarities found in Haydn's original manuscript.