In the absence of both the autograph score and an authentic set of parts, this edition presents as faithfully as possible the intentions of the composer as transmitted in the Sieber print. A number of variants have been adopted from other sources, notably the Welcker edition, on the rare occasions where they appear more convincing than Sieber's text. The style and notation of articulation and dynamic markings have been standardised throughout and, where missing from the source, markings have been reconstructed from parallel passages. These are indicated by the use of dotted slurs or brackets. Like most eighteenth-century sources, the present manuscript is inconsistent at in its notation of appoggiature ; these too have been standardised to minimise confusion. Obvious wrong notes have been corrected without comment; text underlay, where confused in the source, has been corrected; editorial emendations with no authority from the source are placed within brackets.