portraits of Mozart a keyboard instrument none showing him playing
a leaf of music paper the concerto idea on the empty top staff red notation Mozart's second thoughts.
later hands appear top margin "By Mozart and in his hand."
left margin "NB / Beginning of an 8-voice fugue."
upper right margin an unknown hand the piano concerto finale.
Mozart's pitches and rhythms unchanged but an overlay--
an incomplete set of instructions for realizing two hundred year old music--
instructions for tempo, fingering, phrasing, articulation, dynamics, pedaling, representing the taste, technique, opinions of performer, pedagogue, scholar.
her late husband's musical manuscripts: sketches or drafts of unrealized works kept for possible completion by others sketches or drafts of completed works
discarded
Words borrowed from: “Mozart and the keyboard culture of his time": https://rmc.library.cornell.edu/mozart/credits.htm